21214233561144 has 128 divisors (see below), whose sum is σ = 60477320312640. Its totient is φ = 6143249129472.

The previous prime is 21214233561113. The next prime is 21214233561149. The reversal of 21214233561144 is 44116533241212.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214233561149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171856854 + ... + 171980250.

Almost surely, 2^{21214233561144} is an apocalyptic number.

21214233561144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21214233561144 is an abundant number, since it is smaller than the sum of its proper divisors (39263086751496).

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

21214233561144 is a wasteful number, since it uses less digits than its factorization.

21214233561144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155849 (or 155845 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The spelling of 21214233561144 in words is "twenty-one trillion, two hundred fourteen billion, two hundred thirty-three million, five hundred sixty-one thousand, one hundred forty-four".