21264446233 has 2 divisors, whose sum is σ = 21264446234. Its totient is φ = 21264446232.

The previous prime is 21264446191. The next prime is 21264446279. The reversal of 21264446233 is 33264446212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11052737424 + 10211708809 = 105132^2 + 101053^2 .

It is a cyclic number.

It is not a de Polignac number, because 21264446233 - 2¹⁷ = 21264315161 is a prime.

It is a super-2 number, since 2×21264446233² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21264446192 and 21264446201.

It is not a weakly prime, because it can be changed into another prime (21264446293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10632223116 + 10632223117.

It is an arithmetic number, because the mean of its divisors is an integer number (10632223117).

Almost surely, 2^21264446233 is an apocalyptic number.

It is an amenable number.

21264446233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21264446233 is an equidigital number, since it uses as much as digits as its factorization.

21264446233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 37.

The spelling of 21264446233 in words is "twenty-one billion, two hundred sixty-four million, four hundred forty-six thousand, two hundred thirty-three".