21253262402 has 64 divisors (see below), whose sum is σ = 36106560000. Its totient is φ = 9322739712.

The previous prime is 21253262377. The next prime is 21253262411. The reversal of 21253262402 is 20426235212.

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, 20259974 + ... + 20261022.

It is an arithmetic number, because the mean of its divisors is an integer number (564165000).

Almost surely, 2^21253262402 is an apocalyptic number.

21253262402 is a deficient number, since it is larger than the sum of its proper divisors (14853297598).

21253262402 is a wasteful number, since it uses less digits than its factorization.

21253262402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21253262402 its reverse (20426235212), we get a palindrome (41679497614).

The spelling of 21253262402 in words is "twenty-one billion, two hundred fifty-three million, two hundred sixty-two thousand, four hundred two".