21512604672240 has 160 divisors (see below), whose sum is σ = 72753428054016. Its totient is φ = 5215054279680.

The previous prime is 21512604672233. The next prime is 21512604672283. The reversal of 21512604672240 is 4227640621512.

It is a junction number, because it is equal to n+sod(n) for n = 21512604672192 and 21512604672201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168217602 + ... + 168345438.

Almost surely, 2^{21512604672240} is an apocalyptic number.

21512604672240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21512604672240 is an abundant number, since it is smaller than the sum of its proper divisors (51240823381776).

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

21512604672240 is a wasteful number, since it uses less digits than its factorization.

21512604672240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191607 (or 191601 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 21512604672240 in words is "twenty-one trillion, five hundred twelve billion, six hundred four million, six hundred seventy-two thousand, two hundred forty".