21265265010 has 64 divisors (see below), whose sum is σ = 55692334080. Its totient is φ = 5153734080.

The previous prime is 21265264981. The next prime is 21265265033. The reversal of 21265265010 is 1056256212.

It is a super-2 number, since 2×21265265010² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1525251 + ... + 1539129.

It is an arithmetic number, because the mean of its divisors is an integer number (870192720).

Almost surely, 2^21265265010 is an apocalyptic number.

21265265010 is an abundant number, since it is smaller than the sum of its proper divisors (34427069070).

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

21265265010 is a wasteful number, since it uses less digits than its factorization.

21265265010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18543.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 21265265010 in words is "twenty-one billion, two hundred sixty-five million, two hundred sixty-five thousand, ten".