12261031620 has 24 divisors (see below), whose sum is σ = 34330888704. Its totient is φ = 3269608416.

The previous prime is 12261031579. The next prime is 12261031633. The reversal of 12261031620 is 2613016221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102175204 + ... + 102175323.

It is an arithmetic number, because the mean of its divisors is an integer number (1430453696).

Almost surely, 2^12261031620 is an apocalyptic number.

12261031620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12261031620 is an abundant number, since it is smaller than the sum of its proper divisors (22069857084).

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

12261031620 is a wasteful number, since it uses less digits than its factorization.

12261031620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204350539 (or 204350537 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 12261031620 its reverse (2613016221), we get a palindrome (14874047841).

The spelling of 12261031620 in words is "twelve billion, two hundred sixty-one million, thirty-one thousand, six hundred twenty".