10012456921 has 2 divisors, whose sum is σ = 10012456922. Its totient is φ = 10012456920.

The previous prime is 10012456907. The next prime is 10012456963. The reversal of 10012456921 is 12965421001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9655813696 + 356643225 = 98264^2 + 18885^2 .

It is a cyclic number.

It is not a de Polignac number, because 10012456921 - 2⁷ = 10012456793 is a prime.

It is not a weakly prime, because it can be changed into another prime (10012456981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5006228460 + 5006228461.

It is an arithmetic number, because the mean of its divisors is an integer number (5006228461).

Almost surely, 2^10012456921 is an apocalyptic number.

It is an amenable number.

10012456921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10012456921 is an equidigital number, since it uses as much as digits as its factorization.

10012456921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 10012456921 its reverse (12965421001), we get a palindrome (22977877922).

The spelling of 10012456921 in words is "ten billion, twelve million, four hundred fifty-six thousand, nine hundred twenty-one".