21232553911 has 2 divisors, whose sum is σ = 21232553912. Its totient is φ = 21232553910.

The previous prime is 21232553897. The next prime is 21232553939. The reversal of 21232553911 is 11935523212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21232553911 - 2⁵ = 21232553879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232553011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616276955 + 10616276956.

It is an arithmetic number, because the mean of its divisors is an integer number (10616276956).

Almost surely, 2^21232553911 is an apocalyptic number.

21232553911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232553911 is an equidigital number, since it uses as much as digits as its factorization.

21232553911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The spelling of 21232553911 in words is "twenty-one billion, two hundred thirty-two million, five hundred fifty-three thousand, nine hundred eleven".