21603156331361 has 4 divisors (see below), whose sum is σ = 23567079634224. Its totient is φ = 19639233028500.

The previous prime is 21603156331357. The next prime is 21603156331451. The reversal of 21603156331361 is 16313365130612.

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 21603156331361 - 2² = 21603156331357 is a prime.

It is a super-2 number, since 2×21603156331361² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21603156331301) 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, 981961651415 + ... + 981961651436.

It is an arithmetic number, because the mean of its divisors is an integer number (5891769908556).

Almost surely, 2^{21603156331361} is an apocalyptic number.

It is an amenable number.

21603156331361 is a deficient number, since it is larger than the sum of its proper divisors (1963923302863).

21603156331361 is a wasteful number, since it uses less digits than its factorization.

21603156331361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963923302862.

The product of its (nonzero) digits is 174960, while the sum is 41.

The spelling of 21603156331361 in words is "twenty-one trillion, six hundred three billion, one hundred fifty-six million, three hundred thirty-one thousand, three hundred sixty-one".