21622361669 has 2 divisors, whose sum is σ = 21622361670. Its totient is φ = 21622361668.

The previous prime is 21622361567. The next prime is 21622361681. The reversal of 21622361669 is 96616322612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21405153025 + 217208644 = 146305^2 + 14738^2 .

It is a cyclic number.

It is not a de Polignac number, because 21622361669 - 2²⁸ = 21353926213 is a prime.

It is a super-2 number, since 2×21622361669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21622361869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811180834 + 10811180835.

It is an arithmetic number, because the mean of its divisors is an integer number (10811180835).

Almost surely, 2^21622361669 is an apocalyptic number.

It is an amenable number.

21622361669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21622361669 is an equidigital number, since it uses as much as digits as its factorization.

21622361669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The spelling of 21622361669 in words is "twenty-one billion, six hundred twenty-two million, three hundred sixty-one thousand, six hundred sixty-nine".