21500157363353 has 4 divisors (see below), whose sum is σ = 22024551445428. Its totient is φ = 20975763281280.

The previous prime is 21500157363341. The next prime is 21500157363449. The reversal of 21500157363353 is 35336375100512.

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 6414452786329 + 15085704577024 = 2532677^2 + 3884032^2 .

It is a cyclic number.

It is not a de Polignac number, because 21500157363353 - 2¹² = 21500157359257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21500157363313) 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, 262197040976 + ... + 262197041057.

It is an arithmetic number, because the mean of its divisors is an integer number (5506137861357).

Almost surely, 2^{21500157363353} is an apocalyptic number.

It is an amenable number.

21500157363353 is a deficient number, since it is larger than the sum of its proper divisors (524394082075).

21500157363353 is an equidigital number, since it uses as much as digits as its factorization.

21500157363353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524394082074.

The product of its (nonzero) digits is 850500, while the sum is 44.

The spelling of 21500157363353 in words is "twenty-one trillion, five hundred billion, one hundred fifty-seven million, three hundred sixty-three thousand, three hundred fifty-three".