21603161101657 has 4 divisors (see below), whose sum is σ = 21626874781056. Its totient is φ = 21579447422260.

The previous prime is 21603161101651. The next prime is 21603161101679. The reversal of 21603161101657 is 75610116130612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21603161101657 - 2¹¹ = 21603161099609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21603161101651) 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, 11856838333 + ... + 11856840154.

It is an arithmetic number, because the mean of its divisors is an integer number (5406718695264).

Almost surely, 2^{21603161101657} is an apocalyptic number.

It is an amenable number.

21603161101657 is a deficient number, since it is larger than the sum of its proper divisors (23713679399).

21603161101657 is an equidigital number, since it uses as much as digits as its factorization.

21603161101657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23713679398.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 21603161101657 in words is "twenty-one trillion, six hundred three billion, one hundred sixty-one million, one hundred one thousand, six hundred fifty-seven".