20552167021 has 2 divisors, whose sum is σ = 20552167022. Its totient is φ = 20552167020.

The previous prime is 20552166923. The next prime is 20552167033. The reversal of 20552167021 is 12076125502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13662336996 + 6889830025 = 116886^2 + 83005^2 .

It is a cyclic number.

It is not a de Polignac number, because 20552167021 - 2³¹ = 18404683373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20552167081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276083510 + 10276083511.

It is an arithmetic number, because the mean of its divisors is an integer number (10276083511).

Almost surely, 2^20552167021 is an apocalyptic number.

It is an amenable number.

20552167021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20552167021 is an equidigital number, since it uses as much as digits as its factorization.

20552167021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 20552167021 in words is "twenty billion, five hundred fifty-two million, one hundred sixty-seven thousand, twenty-one".