21042331973520 has 960 divisors, whose sum is σ = 79398670445568. Its totient is φ = 4566481920000.

The previous prime is 21042331973497. The next prime is 21042331973543. The reversal of 21042331973520 is 2537913324012.

It is an interprime number because it is at equal distance from previous prime (21042331973497) and next prime (21042331973543).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5464119595 + ... + 5464123445.

Almost surely, 2^{21042331973520} is an apocalyptic number.

21042331973520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21042331973520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39699335222784).

21042331973520 is an abundant number, since it is smaller than the sum of its proper divisors (58356338472048).

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

21042331973520 is a wasteful number, since it uses less digits than its factorization.

21042331973520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The spelling of 21042331973520 in words is "twenty-one trillion, forty-two billion, three hundred thirty-one million, nine hundred seventy-three thousand, five hundred twenty".