21494231697 has 8 divisors (see below), whose sum is σ = 29433542656. Its totient is φ = 13942204272.

The previous prime is 21494231663. The next prime is 21494231719. The reversal of 21494231697 is 79613249412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21494231697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21494231657) 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, 96820753 + ... + 96820974.

It is an arithmetic number, because the mean of its divisors is an integer number (3679192832).

Almost surely, 2^21494231697 is an apocalyptic number.

It is an amenable number.

21494231697 is a deficient number, since it is larger than the sum of its proper divisors (7939310959).

21494231697 is a wasteful number, since it uses less digits than its factorization.

21494231697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193641767.

The product of its digits is 653184, while the sum is 48.

The spelling of 21494231697 in words is "twenty-one billion, four hundred ninety-four million, two hundred thirty-one thousand, six hundred ninety-seven".