20999952433 has 2 divisors, whose sum is σ = 20999952434. Its totient is φ = 20999952432.

The previous prime is 20999952409. The next prime is 20999952469. The reversal of 20999952433 is 33425999902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10881201969 + 10118750464 = 104313^2 + 100592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20999952433 is a prime.

It is not a weakly prime, because it can be changed into another prime (20999952473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499976216 + 10499976217.

It is an arithmetic number, because the mean of its divisors is an integer number (10499976217).

Almost surely, 2^20999952433 is an apocalyptic number.

It is an amenable number.

20999952433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20999952433 is an equidigital number, since it uses as much as digits as its factorization.

20999952433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4723920, while the sum is 55.

The spelling of 20999952433 in words is "twenty billion, nine hundred ninety-nine million, nine hundred fifty-two thousand, four hundred thirty-three".