21602474054657 has 4 divisors (see below), whose sum is σ = 22873207822596. Its totient is φ = 20331740286720.

The previous prime is 21602474054621. The next prime is 21602474054677. The reversal of 21602474054657 is 75645047420612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15649928088001 + 5952545966656 = 3955999^2 + 2439784^2 .

It is a cyclic number.

It is not a de Polignac number, because 21602474054657 - 2⁸ = 21602474054401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21602474054599 and 21602474054608.

It is not an unprimeable number, because it can be changed into a prime (21602474054677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635366883944 + ... + 635366883977.

It is an arithmetic number, because the mean of its divisors is an integer number (5718301955649).

Almost surely, 2^{21602474054657} is an apocalyptic number.

It is an amenable number.

21602474054657 is a deficient number, since it is larger than the sum of its proper divisors (1270733767939).

21602474054657 is a wasteful number, since it uses less digits than its factorization.

21602474054657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270733767938.

The product of its (nonzero) digits is 11289600, while the sum is 53.

The spelling of 21602474054657 in words is "twenty-one trillion, six hundred two billion, four hundred seventy-four million, fifty-four thousand, six hundred fifty-seven".