21144326512 has 20 divisors (see below), whose sum is σ = 42748313040. Its totient is φ = 10112503808.

The previous prime is 21144326507. The next prime is 21144326513. The reversal of 21144326512 is 21562344112.

It is a super-2 number, since 2×21144326512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144326513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28728337 + ... + 28729072.

It is an arithmetic number, because the mean of its divisors is an integer number (2137415652).

Almost surely, 2^21144326512 is an apocalyptic number.

It is an amenable number.

21144326512 is an abundant number, since it is smaller than the sum of its proper divisors (21603986528).

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

21144326512 is a wasteful number, since it uses less digits than its factorization.

21144326512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57457440 (or 57457434 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The spelling of 21144326512 in words is "twenty-one billion, one hundred forty-four million, three hundred twenty-six thousand, five hundred twelve".