21443542551342 has 24 divisors (see below), whose sum is σ = 46461110295600. Its totient is φ = 7147831911840.

The previous prime is 21443542551323. The next prime is 21443542551349. The reversal of 21443542551342 is 24315524534412.

21443542551342 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 3 + 54 + 2 + 551 + 3 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443542551349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9678367 + ... + 11685797.

It is an arithmetic number, because the mean of its divisors is an integer number (1935879595650).

Almost surely, 2^{21443542551342} is an apocalyptic number.

21443542551342 is an abundant number, since it is smaller than the sum of its proper divisors (25017567744258).

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

21443542551342 is a wasteful number, since it uses less digits than its factorization.

21443542551342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600888 (or 2600885 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 45.

The spelling of 21443542551342 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-two million, five hundred fifty-one thousand, three hundred forty-two".