21560142054 has 64 divisors (see below), whose sum is σ = 48448212480. Its totient is φ = 6338833920.

The previous prime is 21560142029. The next prime is 21560142073. The reversal of 21560142054 is 45024106512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 864382 + ... + 888974.

It is an arithmetic number, because the mean of its divisors is an integer number (757003320).

Almost surely, 2^21560142054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21560142054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24224106240).

21560142054 is an abundant number, since it is smaller than the sum of its proper divisors (26888070426).

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

21560142054 is a wasteful number, since it uses less digits than its factorization.

21560142054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25005.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21560142054 its reverse (45024106512), we get a palindrome (66584248566).

The spelling of 21560142054 in words is "twenty-one billion, five hundred sixty million, one hundred forty-two thousand, fifty-four".