21777948342 has 12 divisors (see below), whose sum is σ = 47185554780. Its totient is φ = 7259316108.

The previous prime is 21777948331. The next prime is 21777948347. The reversal of 21777948342 is 24384977712.

21777948342 is a `hidden beast` number, since 21 + 77 + 79 + 483 + 4 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21777948347) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 604942992 + ... + 604943027.

It is an arithmetic number, because the mean of its divisors is an integer number (3932129565).

Almost surely, 2^21777948342 is an apocalyptic number.

21777948342 is an abundant number, since it is smaller than the sum of its proper divisors (25407606438).

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

21777948342 is a wasteful number, since it uses less digits than its factorization.

21777948342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209886027 (or 1209886024 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The spelling of 21777948342 in words is "twenty-one billion, seven hundred seventy-seven million, nine hundred forty-eight thousand, three hundred forty-two".