21602353745657 has 8 divisors (see below), whose sum is σ = 22879063524096. Its totient is φ = 20326308754752.

The previous prime is 21602353745653. The next prime is 21602353745683. The reversal of 21602353745657 is 75654735320612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21602353745657 - 2² = 21602353745653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21602353745653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166129973 + ... + 166259954.

It is an arithmetic number, because the mean of its divisors is an integer number (2859882940512).

Almost surely, 2^{21602353745657} is an apocalyptic number.

It is an amenable number.

21602353745657 is a deficient number, since it is larger than the sum of its proper divisors (1276709778439).

21602353745657 is a wasteful number, since it uses less digits than its factorization.

21602353745657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332393767.

The product of its (nonzero) digits is 31752000, while the sum is 56.

The spelling of 21602353745657 in words is "twenty-one trillion, six hundred two billion, three hundred fifty-three million, seven hundred forty-five thousand, six hundred fifty-seven".