21252333677 has 2 divisors, whose sum is σ = 21252333678. Its totient is φ = 21252333676.

The previous prime is 21252333629. The next prime is 21252333719. The reversal of 21252333677 is 77633325212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20727648841 + 524684836 = 143971^2 + 22906^2 .

It is a cyclic number.

It is not a de Polignac number, because 21252333677 - 2³² = 16957366381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21252333077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626166838 + 10626166839.

It is an arithmetic number, because the mean of its divisors is an integer number (10626166839).

Almost surely, 2^21252333677 is an apocalyptic number.

It is an amenable number.

21252333677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252333677 is an equidigital number, since it uses as much as digits as its factorization.

21252333677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 41.

Adding to 21252333677 its reverse (77633325212), we get a palindrome (98885658889).

The spelling of 21252333677 in words is "twenty-one billion, two hundred fifty-two million, three hundred thirty-three thousand, six hundred seventy-seven".