21697214023 has 2 divisors, whose sum is σ = 21697214024. Its totient is φ = 21697214022.

The previous prime is 21697214017. The next prime is 21697214051. The reversal of 21697214023 is 32041279612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21697214023 - 2²¹ = 21695116871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21697214323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848607011 + 10848607012.

It is an arithmetic number, because the mean of its divisors is an integer number (10848607012).

Almost surely, 2^21697214023 is an apocalyptic number.

21697214023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21697214023 is an equidigital number, since it uses as much as digits as its factorization.

21697214023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 21697214023 in words is "twenty-one billion, six hundred ninety-seven million, two hundred fourteen thousand, twenty-three".