21610347552 has 36 divisors (see below), whose sum is σ = 61454426670. Its totient is φ = 7203449088.

The previous prime is 21610347491. The next prime is 21610347569. The reversal of 21610347552 is 25574301612.

21610347552 is a `hidden beast` number, since 2 + 1 + 61 + 0 + 3 + 47 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15464414736 + 6145932816 = 124356^2 + 78396^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37517677 + ... + 37518252.

Almost surely, 2^21610347552 is an apocalyptic number.

It is an amenable number.

21610347552 is an abundant number, since it is smaller than the sum of its proper divisors (39844079118).

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

21610347552 is a wasteful number, since it uses less digits than its factorization.

21610347552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75035945 (or 75035934 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 21610347552 in words is "twenty-one billion, six hundred ten million, three hundred forty-seven thousand, five hundred fifty-two".