21451755715412 has 96 divisors (see below), whose sum is σ = 42346456965120. Its totient is φ = 9420192432000.

The previous prime is 21451755715387. The next prime is 21451755715427.

21451755715412 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21451755715412² (a number of 27 digits) contains 22 as substring.

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, 2359664987 + ... + 2359674077.

It is an arithmetic number, because the mean of its divisors is an integer number (441108926720).

Almost surely, 2^{21451755715412} is an apocalyptic number.

21451755715412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21451755715412 is a deficient number, since it is larger than the sum of its proper divisors (20894701249708).

21451755715412 is a wasteful number, since it uses less digits than its factorization.

21451755715412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11893 (or 11891 counting only the distinct ones).

The product of its digits is 1960000, while the sum is 50.

The spelling of 21451755715412 in words is "twenty-one trillion, four hundred fifty-one billion, seven hundred fifty-five million, seven hundred fifteen thousand, four hundred twelve".