21763735369 has 2 divisors, whose sum is σ = 21763735370. Its totient is φ = 21763735368.

The previous prime is 21763735351. The next prime is 21763735397. The reversal of 21763735369 is 96353736712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12337655625 + 9426079744 = 111075^2 + 97088^2 .

It is a cyclic number.

It is not a de Polignac number, because 21763735369 - 2⁵ = 21763735337 is a prime.

It is a super-2 number, since 2×21763735369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21763735339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10881867684 + 10881867685.

It is an arithmetic number, because the mean of its divisors is an integer number (10881867685).

Almost surely, 2^21763735369 is an apocalyptic number.

It is an amenable number.

21763735369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21763735369 is an equidigital number, since it uses as much as digits as its factorization.

21763735369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 52.

The spelling of 21763735369 in words is "twenty-one billion, seven hundred sixty-three million, seven hundred thirty-five thousand, three hundred sixty-nine".