21653222616602 has 4 divisors (see below), whose sum is σ = 32479833924906. Its totient is φ = 10826611308300.

The previous prime is 21653222616589. The next prime is 21653222616661. The reversal of 21653222616602 is 20661622235612.

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., 19307947834561 + 2345274782041 = 4394081^2 + 1531429^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5413305654149 + ... + 5413305654152.

Almost surely, 2^{21653222616602} is an apocalyptic number.

21653222616602 is a deficient number, since it is larger than the sum of its proper divisors (10826611308304).

21653222616602 is a wasteful number, since it uses less digits than its factorization.

21653222616602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10826611308303.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 21653222616602 in words is "twenty-one trillion, six hundred fifty-three billion, two hundred twenty-two million, six hundred sixteen thousand, six hundred two".