21154521023227 has 2 divisors, whose sum is σ = 21154521023228. Its totient is φ = 21154521023226.

The previous prime is 21154521023179. The next prime is 21154521023303. The reversal of 21154521023227 is 72232012545112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21154521023227 - 2²⁷ = 21154386805499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21154521023527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577260511613 + 10577260511614.

It is an arithmetic number, because the mean of its divisors is an integer number (10577260511614).

Almost surely, 2^{21154521023227} is an apocalyptic number.

21154521023227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154521023227 is an equidigital number, since it uses as much as digits as its factorization.

21154521023227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 37.

Adding to 21154521023227 its reverse (72232012545112), we get a palindrome (93386533568339).

The spelling of 21154521023227 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred twenty-one million, twenty-three thousand, two hundred twenty-seven".