21097900423 has 8 divisors (see below), whose sum is σ = 21803338880. Its totient is φ = 20394015840.

The previous prime is 21097900399. The next prime is 21097900433. The reversal of 21097900423 is 32400979012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21097900423 - 2²¹ = 21095803271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097900433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360828 + ... + 415201.

It is an arithmetic number, because the mean of its divisors is an integer number (2725417360).

Almost surely, 2^21097900423 is an apocalyptic number.

21097900423 is a deficient number, since it is larger than the sum of its proper divisors (705438457).

21097900423 is an equidigital number, since it uses as much as digits as its factorization.

21097900423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776937.

The product of its (nonzero) digits is 27216, while the sum is 37.

The spelling of 21097900423 in words is "twenty-one billion, ninety-seven million, nine hundred thousand, four hundred twenty-three".