21134020402 has 16 divisors (see below), whose sum is σ = 34645050432. Its totient is φ = 9589120720.

The previous prime is 21134020399. The next prime is 21134020463. The reversal of 21134020402 is 20402043112.

It is a self number, because there is not a number n which added to its sum of digits gives 21134020402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850078 + ... + 874585.

It is an arithmetic number, because the mean of its divisors is an integer number (2165315652).

Almost surely, 2^21134020402 is an apocalyptic number.

21134020402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21134020402 is a deficient number, since it is larger than the sum of its proper divisors (13511030030).

21134020402 is a wasteful number, since it uses less digits than its factorization.

21134020402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725233.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21134020402 its reverse (20402043112), we get a palindrome (41536063514).

The spelling of 21134020402 in words is "twenty-one billion, one hundred thirty-four million, twenty thousand, four hundred two".