12561021310 has 16 divisors (see below), whose sum is σ = 22947299856. Its totient is φ = 4949417088.

The previous prime is 12561021307. The next prime is 12561021337. The reversal of 12561021310 is 1312016521.

It is a happy number.

It is a super-2 number, since 2×12561021310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 9373227 + ... + 9374566.

It is an arithmetic number, because the mean of its divisors is an integer number (1434206241).

Almost surely, 2^12561021310 is an apocalyptic number.

12561021310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12561021310 is a deficient number, since it is larger than the sum of its proper divisors (10386278546).

12561021310 is a wasteful number, since it uses less digits than its factorization.

12561021310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18747867.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 12561021310 its reverse (1312016521), we get a palindrome (13873037831).

The spelling of 12561021310 in words is "twelve billion, five hundred sixty-one million, twenty-one thousand, three hundred ten".