21533324106660 has 48 divisors (see below), whose sum is σ = 60297983928000. Its totient is φ = 5741774387584.

The previous prime is 21533324106653. The next prime is 21533324106667. The reversal of 21533324106660 is 6660142333512.

It is an interprime number because it is at equal distance from previous prime (21533324106653) and next prime (21533324106667).

It is not an unprimeable number, because it can be changed into a prime (21533324106667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13137555 + ... + 14685434.

It is an arithmetic number, because the mean of its divisors is an integer number (1256207998500).

Almost surely, 2^{21533324106660} is an apocalyptic number.

21533324106660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533324106660 is an abundant number, since it is smaller than the sum of its proper divisors (38764659821340).

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

21533324106660 is a wasteful number, since it uses less digits than its factorization.

21533324106660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27835900 (or 27835898 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 21533324106660 in words is "twenty-one trillion, five hundred thirty-three billion, three hundred twenty-four million, one hundred six thousand, six hundred sixty".