21598298831 has 8 divisors (see below), whose sum is σ = 22060188864. Its totient is φ = 21136506880.

The previous prime is 21598298803. The next prime is 21598298851. The reversal of 21598298831 is 13889289512.

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 21598298831 - 2¹⁰ = 21598297807 is a prime.

It is a super-2 number, since 2×21598298831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21598298801) 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, 575951 + ... + 612303.

It is an arithmetic number, because the mean of its divisors is an integer number (2757523608).

Almost surely, 2^21598298831 is an apocalyptic number.

21598298831 is a deficient number, since it is larger than the sum of its proper divisors (461890033).

21598298831 is a wasteful number, since it uses less digits than its factorization.

21598298831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49041.

The product of its digits is 2488320, while the sum is 56.

The spelling of 21598298831 in words is "twenty-one billion, five hundred ninety-eight million, two hundred ninety-eight thousand, eight hundred thirty-one".