21266525262 has 16 divisors (see below), whose sum is σ = 42542634240. Its totient is φ = 7087244472.

The previous prime is 21266525227. The next prime is 21266525303. The reversal of 21266525262 is 26252566212.

It is a self number, because there is not a number n which added to its sum of digits gives 21266525262.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370312 + ... + 423867.

It is an arithmetic number, because the mean of its divisors is an integer number (2658914640).

Almost surely, 2^21266525262 is an apocalyptic number.

21266525262 is an abundant number, since it is smaller than the sum of its proper divisors (21276108978).

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

21266525262 is a wasteful number, since it uses less digits than its factorization.

21266525262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798647.

The product of its digits is 172800, while the sum is 39.

The spelling of 21266525262 in words is "twenty-one billion, two hundred sixty-six million, five hundred twenty-five thousand, two hundred sixty-two".