21264602744 has 64 divisors (see below), whose sum is σ = 50390519040. Its totient is φ = 8171400960.

The previous prime is 21264602743. The next prime is 21264602747. The reversal of 21264602744 is 44720646212.

It is a junction number, because it is equal to n+sod(n) for n = 21264602698 and 21264602707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264602743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191474 + ... + 281409.

It is an arithmetic number, because the mean of its divisors is an integer number (787351860).

Almost surely, 2^21264602744 is an apocalyptic number.

It is an amenable number.

21264602744 is an abundant number, since it is smaller than the sum of its proper divisors (29125916296).

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

21264602744 is a wasteful number, since it uses less digits than its factorization.

21264602744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472980 (or 472976 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 38.

The spelling of 21264602744 in words is "twenty-one billion, two hundred sixty-four million, six hundred two thousand, seven hundred forty-four".