21976142633 has 2 divisors, whose sum is σ = 21976142634. Its totient is φ = 21976142632.

The previous prime is 21976142593. The next prime is 21976142651. The reversal of 21976142633 is 33624167912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16066069504 + 5910073129 = 126752^2 + 76877^2 .

It is a cyclic number.

It is not a de Polignac number, because 21976142633 - 2³⁰ = 20902400809 is a prime.

It is not a weakly prime, because it can be changed into another prime (21976142533) 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, 10988071316 + 10988071317.

It is an arithmetic number, because the mean of its divisors is an integer number (10988071317).

Almost surely, 2^21976142633 is an apocalyptic number.

It is an amenable number.

21976142633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21976142633 is an equidigital number, since it uses as much as digits as its factorization.

21976142633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The spelling of 21976142633 in words is "twenty-one billion, nine hundred seventy-six million, one hundred forty-two thousand, six hundred thirty-three".