21322553377 has 2 divisors, whose sum is σ = 21322553378. Its totient is φ = 21322553376.

The previous prime is 21322553347. The next prime is 21322553387. The reversal of 21322553377 is 77335522312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11024160016 + 10298393361 = 104996^2 + 101481^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322553377 - 2⁷ = 21322553249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322553347) 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, 10661276688 + 10661276689.

It is an arithmetic number, because the mean of its divisors is an integer number (10661276689).

Almost surely, 2^21322553377 is an apocalyptic number.

It is an amenable number.

21322553377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322553377 is an equidigital number, since it uses as much as digits as its factorization.

21322553377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 40.

The spelling of 21322553377 in words is "twenty-one billion, three hundred twenty-two million, five hundred fifty-three thousand, three hundred seventy-seven".