21146631641 has 12 divisors (see below), whose sum is σ = 22120575120. Its totient is φ = 20213900520.

The previous prime is 21146631637. The next prime is 21146631739. The reversal of 21146631641 is 14613664112.

It is not a de Polignac number, because 21146631641 - 2² = 21146631637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21146631601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 844106 + ... + 868796.

It is an arithmetic number, because the mean of its divisors is an integer number (1843381260).

Almost surely, 2^21146631641 is an apocalyptic number.

It is an amenable number.

21146631641 is a deficient number, since it is larger than the sum of its proper divisors (973943479).

21146631641 is a wasteful number, since it uses less digits than its factorization.

21146631641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26356 (or 26333 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The spelling of 21146631641 in words is "twenty-one billion, one hundred forty-six million, six hundred thirty-one thousand, six hundred forty-one".