1211450320 has 20 divisors (see below), whose sum is σ = 2816622180. Its totient is φ = 484580096.

The previous prime is 1211450299. The next prime is 1211450327. The reversal of 1211450320 is 230541121.

It can be written as a sum of positive squares in 2 ways, for example, as 128777104 + 1082673216 = 11348^2 + 32904^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×1211450320³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211450327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7571485 + ... + 7571644.

It is an arithmetic number, because the mean of its divisors is an integer number (140831109).

Almost surely, 2^1211450320 is an apocalyptic number.

1211450320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211450320 is an abundant number, since it is smaller than the sum of its proper divisors (1605171860).

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

1211450320 is a wasteful number, since it uses less digits than its factorization.

1211450320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15143142 (or 15143136 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1211450320 is about 34805.8949030189. The cubic root of 1211450320 is about 1066.0278145012.

Adding to 1211450320 its reverse (230541121), we get a palindrome (1441991441).

The spelling of 1211450320 in words is "one billion, two hundred eleven million, four hundred fifty thousand, three hundred twenty".