21144044412 has 48 divisors (see below), whose sum is σ = 55568843680. Its totient is φ = 6951464064.

The previous prime is 21144044401. The next prime is 21144044429. The reversal of 21144044412 is 21444044112.

It is a happy number.

21144044412 is a `hidden beast` number, since 211 + 4 + 4 + 0 + 4 + 441 + 2 = 666.

It is a super-2 number, since 2×21144044412² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1333063 + ... + 1348830.

Almost surely, 2^21144044412 is an apocalyptic number.

It is an amenable number.

21144044412 is an abundant number, since it is smaller than the sum of its proper divisors (34424799268).

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

21144044412 is a wasteful number, since it uses less digits than its factorization.

21144044412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681979 (or 2681971 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 21144044412 its reverse (21444044112), we get a palindrome (42588088524).

The spelling of 21144044412 in words is "twenty-one billion, one hundred forty-four million, forty-four thousand, four hundred twelve".