21023340021312 has 56 divisors (see below), whose sum is σ = 57418584590592. Its totient is φ = 6781722585600.

The previous prime is 21023340021269. The next prime is 21023340021319. The reversal of 21023340021312 is 21312004332012.

It is a super-2 number, since 2×21023340021312² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21023340021319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1766067639 + ... + 1766079542.

Almost surely, 2^{21023340021312} is an apocalyptic number.

It is an amenable number.

21023340021312 is an abundant number, since it is smaller than the sum of its proper divisors (36395244569280).

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

21023340021312 is a wasteful number, since it uses less digits than its factorization.

21023340021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532147227 (or 3532147217 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21023340021312 its reverse (21312004332012), we get a palindrome (42335344353324).

The spelling of 21023340021312 in words is "twenty-one trillion, twenty-three billion, three hundred forty million, twenty-one thousand, three hundred twelve".