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1221220312 = 231311742503
BaseRepresentation
bin100100011001010…
…0101011111011000
310011002221102022221
41020302211133120
510000113022222
6321102553424
742156126034
oct11062453730
93132842287
101221220312
1157738a994
122a0b98874
13166014190
14b82951c4
157232d0c7
hex48ca57d8

1221220312 has 16 divisors (see below), whose sum is σ = 2465925840. Its totient is φ = 563640096.

The previous prime is 1221220303. The next prime is 1221220327. The reversal of 1221220312 is 2130221221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5871148 + ... + 5871355.

It is an arithmetic number, because the mean of its divisors is an integer number (154120365).

Almost surely, 21221220312 is an apocalyptic number.

It is an amenable number.

1221220312 is an abundant number, since it is smaller than the sum of its proper divisors (1244705528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221220312 is a wasteful number, since it uses less digits than its factorization.

1221220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11742522 (or 11742518 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221220312 is about 34945.9627424972. The cubic root of 1221220312 is about 1068.8858790931.

Adding to 1221220312 its reverse (2130221221), we get a palindrome (3351441533).

Subtracting 1221220312 from its reverse (2130221221), we obtain a palindrome (909000909).

The spelling of 1221220312 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, three hundred twelve".

Divisors: 1 2 4 8 13 26 52 104 11742503 23485006 46970012 93940024 152652539 305305078 610610156 1221220312