21312121332030 has 64 divisors (see below), whose sum is σ = 52123340464128. Its totient is φ = 5575468959360.

The previous prime is 21312121331971. The next prime is 21312121332049. The reversal of 21312121332030 is 3023312121312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14502724 + ... + 15904503.

It is an arithmetic number, because the mean of its divisors is an integer number (814427194752).

Almost surely, 2^{21312121332030} is an apocalyptic number.

21312121332030 is an abundant number, since it is smaller than the sum of its proper divisors (30811219132098).

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

21312121332030 is a wasteful number, since it uses less digits than its factorization.

21312121332030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30407681.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21312121332030 its reverse (3023312121312), we get a palindrome (24335433453342).

The spelling of 21312121332030 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-one million, three hundred thirty-two thousand, thirty".