21634927033 has 2 divisors, whose sum is σ = 21634927034. Its totient is φ = 21634927032.

The previous prime is 21634927019. The next prime is 21634927057. The reversal of 21634927033 is 33072943612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21561104569 + 73822464 = 146837^2 + 8592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21634927033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21634927933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817463516 + 10817463517.

It is an arithmetic number, because the mean of its divisors is an integer number (10817463517).

Almost surely, 2^21634927033 is an apocalyptic number.

It is an amenable number.

21634927033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21634927033 is an equidigital number, since it uses as much as digits as its factorization.

21634927033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 40.

The spelling of 21634927033 in words is "twenty-one billion, six hundred thirty-four million, nine hundred twenty-seven thousand, thirty-three".