21125410312 has 16 divisors (see below), whose sum is σ = 39611763900. Its totient is φ = 10562273280.

The previous prime is 21125410309. The next prime is 21125410331. The reversal of 21125410312 is 21301452112.

It can be written as a sum of positive squares in 2 ways, for example, as 21084782436 + 40627876 = 145206^2 + 6374^2 .

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, 264264 + ... + 334792.

Almost surely, 2^21125410312 is an apocalyptic number.

It is an amenable number.

21125410312 is a deficient number, since it is larger than the sum of its proper divisors (18486353588).

21125410312 is a wasteful number, since it uses less digits than its factorization.

21125410312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107976 (or 107972 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21125410312 its reverse (21301452112), we get a palindrome (42426862424).

The spelling of 21125410312 in words is "twenty-one billion, one hundred twenty-five million, four hundred ten thousand, three hundred twelve".