21252652002 has 24 divisors (see below), whose sum is σ = 46916233884. Its totient is φ = 6950552544.

The previous prime is 21252651971. The next prime is 21252652049. The reversal of 21252652002 is 20025625212.

21252652002 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 2 + 652 + 0 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18749551041 + 2503100961 = 136929^2 + 50031^2 .

It is a super-2 number, since 2×21252652002² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11137753 + ... + 11139660.

Almost surely, 2^21252652002 is an apocalyptic number.

21252652002 is an abundant number, since it is smaller than the sum of its proper divisors (25663581882).

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

21252652002 is a wasteful number, since it uses less digits than its factorization.

21252652002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22277474 (or 22277471 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21252652002 in words is "twenty-one billion, two hundred fifty-two million, six hundred fifty-two thousand, two".