21920985433 has 2 divisors, whose sum is σ = 21920985434. Its totient is φ = 21920985432.

The previous prime is 21920985397. The next prime is 21920985469. The reversal of 21920985433 is 33458902912.

It is a balanced prime because it is at equal distance from previous prime (21920985397) and next prime (21920985469).

It can be written as a sum of positive squares in only one way, i.e., 16838436169 + 5082549264 = 129763^2 + 71292^2 .

It is a cyclic number.

It is not a de Polignac number, because 21920985433 - 2²⁵ = 21887431001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21920985473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10960492716 + 10960492717.

It is an arithmetic number, because the mean of its divisors is an integer number (10960492717).

Almost surely, 2^21920985433 is an apocalyptic number.

It is an amenable number.

21920985433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21920985433 is an equidigital number, since it uses as much as digits as its factorization.

21920985433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 21920985433 in words is "twenty-one billion, nine hundred twenty million, nine hundred eighty-five thousand, four hundred thirty-three".