21652405602242 has 4 divisors (see below), whose sum is σ = 32478608403366. Its totient is φ = 10826202801120.

The previous prime is 21652405602181. The next prime is 21652405602299. The reversal of 21652405602242 is 24220650425612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21345499574161 + 306906028081 = 4620119^2 + 553991^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21652405602242.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5413101400559 + ... + 5413101400562.

Almost surely, 2^{21652405602242} is an apocalyptic number.

21652405602242 is a deficient number, since it is larger than the sum of its proper divisors (10826202801124).

21652405602242 is a wasteful number, since it uses less digits than its factorization.

21652405602242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10826202801123.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 21652405602242 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred five million, six hundred two thousand, two hundred forty-two".