21355630315157 has 16 divisors (see below), whose sum is σ = 23028173011200. Its totient is φ = 19737955791360.

The previous prime is 21355630315141. The next prime is 21355630315163. The reversal of 21355630315157 is 75151303655312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21355630315157 - 2⁴ = 21355630315141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355630345157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119477069 + ... + 119655677.

It is an arithmetic number, because the mean of its divisors is an integer number (1439260813200).

Almost surely, 2^{21355630315157} is an apocalyptic number.

It is an amenable number.

21355630315157 is a deficient number, since it is larger than the sum of its proper divisors (1672542696043).

21355630315157 is a wasteful number, since it uses less digits than its factorization.

21355630315157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332156.

The product of its (nonzero) digits is 1417500, while the sum is 47.

The spelling of 21355630315157 in words is "twenty-one trillion, three hundred fifty-five billion, six hundred thirty million, three hundred fifteen thousand, one hundred fifty-seven".