21213611433144 has 48 divisors (see below), whose sum is σ = 61873033349400. Its totient is φ = 6527265056064.

The previous prime is 21213611433137. The next prime is 21213611433169. The reversal of 21213611433144 is 44133411631212.

21213611433144 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 611 + 4 + 3 + 31 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21213611433099 and 21213611433108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11332056454 + ... + 11332058325.

Almost surely, 2^{21213611433144} is an apocalyptic number.

21213611433144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21213611433144 is an abundant number, since it is smaller than the sum of its proper divisors (40659421916256).

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

21213611433144 is a wasteful number, since it uses less digits than its factorization.

21213611433144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22664114804 (or 22664114797 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 21213611433144 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, four hundred thirty-three thousand, one hundred forty-four".