10256420621 has 4 divisors (see below), whose sum is σ = 10289189052. Its totient is φ = 10223652192.

The previous prime is 10256420617. The next prime is 10256420651. The reversal of 10256420621 is 12602465201.

10256420621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2478944521 + 7777476100 = 49789^2 + 88190^2 .

It is a cyclic number.

It is not a de Polignac number, because 10256420621 - 2² = 10256420617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10256420651) 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, 16383746 + ... + 16384371.

It is an arithmetic number, because the mean of its divisors is an integer number (2572297263).

Almost surely, 2^10256420621 is an apocalyptic number.

It is an amenable number.

10256420621 is a deficient number, since it is larger than the sum of its proper divisors (32768431).

10256420621 is an equidigital number, since it uses as much as digits as its factorization.

10256420621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32768430.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 10256420621 its reverse (12602465201), we get a palindrome (22858885822).

The spelling of 10256420621 in words is "ten billion, two hundred fifty-six million, four hundred twenty thousand, six hundred twenty-one".