21545552524444 has 72 divisors (see below), whose sum is σ = 42124893546960. Its totient is φ = 9631764979200.

The previous prime is 21545552524411. The next prime is 21545552524477. The reversal of 21545552524444 is 44442525554512.

It is an interprime number because it is at equal distance from previous prime (21545552524411) and next prime (21545552524477).

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 21545552524391 and 21545552524400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1056234 + ... + 6648814.

It is an arithmetic number, because the mean of its divisors is an integer number (585067965930).

Almost surely, 2^{21545552524444} is an apocalyptic number.

It is an amenable number.

21545552524444 is a deficient number, since it is larger than the sum of its proper divisors (20579341022516).

21545552524444 is a wasteful number, since it uses less digits than its factorization.

21545552524444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592791 (or 5592776 counting only the distinct ones).

The product of its digits is 25600000, while the sum is 52.

The spelling of 21545552524444 in words is "twenty-one trillion, five hundred forty-five billion, five hundred fifty-two million, five hundred twenty-four thousand, four hundred forty-four".