21675237540 has 48 divisors (see below), whose sum is σ = 66208000320. Its totient is φ = 5254602880.

The previous prime is 21675237539. The next prime is 21675237583. The reversal of 21675237540 is 4573257612.

It is a junction number, because it is equal to n+sod(n) for n = 21675237492 and 21675237501.

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, 16419975 + ... + 16421294.

It is an arithmetic number, because the mean of its divisors is an integer number (1379333340).

Almost surely, 2^21675237540 is an apocalyptic number.

21675237540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21675237540 is an abundant number, since it is smaller than the sum of its proper divisors (44532762780).

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

21675237540 is a wasteful number, since it uses less digits than its factorization.

21675237540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32841292 (or 32841290 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 42.

The spelling of 21675237540 in words is "twenty-one billion, six hundred seventy-five million, two hundred thirty-seven thousand, five hundred forty".