21369004634 has 32 divisors (see below), whose sum is σ = 33708839040. Its totient is φ = 10140242112.

The previous prime is 21369004549. The next prime is 21369004639. The reversal of 21369004634 is 43640096312.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21369004639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4350572 + ... + 4355480.

It is an arithmetic number, because the mean of its divisors is an integer number (1053401220).

Almost surely, 2^21369004634 is an apocalyptic number.

21369004634 is a deficient number, since it is larger than the sum of its proper divisors (12339834406).

21369004634 is a wasteful number, since it uses less digits than its factorization.

21369004634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5654.

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 21369004634 in words is "twenty-one billion, three hundred sixty-nine million, four thousand, six hundred thirty-four".