21697034663 has 2 divisors, whose sum is σ = 21697034664. Its totient is φ = 21697034662.

The previous prime is 21697034561. The next prime is 21697034677. The reversal of 21697034663 is 36643079612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21697034663 - 2²⁶ = 21629925799 is a prime.

It is a super-2 number, since 2×21697034663² (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 (21697054663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848517331 + 10848517332.

It is an arithmetic number, because the mean of its divisors is an integer number (10848517332).

Almost surely, 2^21697034663 is an apocalyptic number.

21697034663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21697034663 is an equidigital number, since it uses as much as digits as its factorization.

21697034663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 47.

The spelling of 21697034663 in words is "twenty-one billion, six hundred ninety-seven million, thirty-four thousand, six hundred sixty-three".