21455741952 has 132 divisors (see below), whose sum is σ = 62594287756. Its totient is φ = 7077888000.

The previous prime is 21455741947. The next prime is 21455742019. The reversal of 21455741952 is 25914755412.

21455741952 is a `hidden beast` number, since 2 + 1 + 4 + 557 + 4 + 1 + 95 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7648551936 + 13807190016 = 87456^2 + 117504^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21455741898 and 21455741907.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 881952 + ... + 905952.

Almost surely, 2^21455741952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21455741952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31297143878).

21455741952 is an abundant number, since it is smaller than the sum of its proper divisors (41138545804).

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

21455741952 is a wasteful number, since it uses less digits than its factorization.

21455741952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24124 (or 24103 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The spelling of 21455741952 in words is "twenty-one billion, four hundred fifty-five million, seven hundred forty-one thousand, nine hundred fifty-two".