21150024456440 has 64 divisors (see below), whose sum is σ = 51917484872160. Its totient is φ = 7690356728320.

The previous prime is 21150024456439. The next prime is 21150024456467. The reversal of 21150024456440 is 4465442005112.

It is a junction number, because it is equal to n+sod(n) for n = 21150024456394 and 21150024456403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4306034 + ... + 7800126.

Almost surely, 2^{21150024456440} is an apocalyptic number.

21150024456440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21150024456440 is an abundant number, since it is smaller than the sum of its proper divisors (30767460415720).

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

21150024456440 is a wasteful number, since it uses less digits than its factorization.

21150024456440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507872 (or 3507868 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 38.

The spelling of 21150024456440 in words is "twenty-one trillion, one hundred fifty billion, twenty-four million, four hundred fifty-six thousand, four hundred forty".