21144234012 has 24 divisors (see below), whose sum is σ = 53821686912. Its totient is φ = 6407343600.

The previous prime is 21144233969. The next prime is 21144234019. The reversal of 21144234012 is 21043244112.

It is a super-2 number, since 2×21144234012² (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 (21144234019) 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, 80091664 + ... + 80091927.

It is an arithmetic number, because the mean of its divisors is an integer number (2242570288).

Almost surely, 2^21144234012 is an apocalyptic number.

21144234012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21144234012 is an abundant number, since it is smaller than the sum of its proper divisors (32677452900).

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

21144234012 is a wasteful number, since it uses less digits than its factorization.

21144234012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160183609 (or 160183607 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21144234012 its reverse (21043244112), we get a palindrome (42187478124).

The spelling of 21144234012 in words is "twenty-one billion, one hundred forty-four million, two hundred thirty-four thousand, twelve".