21121504552231 has 2 divisors, whose sum is σ = 21121504552232. Its totient is φ = 21121504552230.

The previous prime is 21121504552201. The next prime is 21121504552259. The reversal of 21121504552231 is 13225540512112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121504552231 - 2⁷ = 21121504552103 is a prime.

It is a super-2 number, since 2×21121504552231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121504552201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560752276115 + 10560752276116.

It is an arithmetic number, because the mean of its divisors is an integer number (10560752276116).

Almost surely, 2^{21121504552231} is an apocalyptic number.

21121504552231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121504552231 is an equidigital number, since it uses as much as digits as its factorization.

21121504552231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 21121504552231 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred four million, five hundred fifty-two thousand, two hundred thirty-one".