21246113631 has 8 divisors (see below), whose sum is σ = 28333102000. Its totient is φ = 14161600512.

The previous prime is 21246113617. The next prime is 21246113641. The reversal of 21246113631 is 13631164212.

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

It is not a de Polignac number, because 21246113631 - 2⁷ = 21246113503 is a prime.

It is a super-2 number, since 2×21246113631² (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 (21246113611) 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, 598690 + ... + 633183.

It is an arithmetic number, because the mean of its divisors is an integer number (3541637750).

Almost surely, 2^21246113631 is an apocalyptic number.

21246113631 is a deficient number, since it is larger than the sum of its proper divisors (7086988369).

21246113631 is a wasteful number, since it uses less digits than its factorization.

21246113631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237625.

The product of its digits is 5184, while the sum is 30.

Adding to 21246113631 its reverse (13631164212), we get a palindrome (34877277843).

The spelling of 21246113631 in words is "twenty-one billion, two hundred forty-six million, one hundred thirteen thousand, six hundred thirty-one".