101220012 has 36 divisors (see below), whose sum is σ = 262780336. Its totient is φ = 32827680.

The previous prime is 101220001. The next prime is 101220013. The reversal of 101220012 is 210022101.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 101219976 and 101220003.

It is not an unprimeable number, because it can be changed into a prime (101220013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36664 + ... + 39327.

Almost surely, 2^101220012 is an apocalyptic number.

101220012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

101220012 is an abundant number, since it is smaller than the sum of its proper divisors (161560324).

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

101220012 is a wasteful number, since it uses less digits than its factorization.

101220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76038 (or 76033 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 101220012 is about 10060.8156726977. The cubic root of 101220012 is about 466.0388566886.

Adding to 101220012 its reverse (210022101), we get a palindrome (311242113).

The spelling of 101220012 in words is "one hundred one million, two hundred twenty thousand, twelve".