21036452444 has 18 divisors (see below), whose sum is σ = 42824207160. Its totient is φ = 9015622392.

The previous prime is 21036452401. The next prime is 21036452467. The reversal of 21036452444 is 44425463012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53664224 + ... + 53664615.

It is an arithmetic number, because the mean of its divisors is an integer number (2379122620).

Almost surely, 2^21036452444 is an apocalyptic number.

It is an amenable number.

21036452444 is an abundant number, since it is smaller than the sum of its proper divisors (21787754716).

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

21036452444 is a wasteful number, since it uses less digits than its factorization.

21036452444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107328857 (or 107328848 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

The spelling of 21036452444 in words is "twenty-one billion, thirty-six million, four hundred fifty-two thousand, four hundred forty-four".