21442191156 has 48 divisors (see below), whose sum is σ = 55638031680. Its totient is φ = 7141332960.

The previous prime is 21442191143. The next prime is 21442191161. The reversal of 21442191156 is 65119124412.

21442191156 is a `hidden beast` number, since 21 + 442 + 191 + 1 + 5 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21442191156.

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, 44566 + ... + 211826.

It is an arithmetic number, because the mean of its divisors is an integer number (1159125660).

Almost surely, 2^21442191156 is an apocalyptic number.

It is an amenable number.

21442191156 is an abundant number, since it is smaller than the sum of its proper divisors (34195840524).

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

21442191156 is a wasteful number, since it uses less digits than its factorization.

21442191156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168461 (or 168453 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 21442191156 in words is "twenty-one billion, four hundred forty-two million, one hundred ninety-one thousand, one hundred fifty-six".