21242277631 has 4 divisors (see below), whose sum is σ = 22491823392. Its totient is φ = 19992731872.

The previous prime is 21242277619. The next prime is 21242277649. The reversal of 21242277631 is 13677224212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21242277631 - 2²⁵ = 21208723199 is a prime.

It is a super-2 number, since 2×21242277631² (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 (21242277611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624772855 + ... + 624772888.

It is an arithmetic number, because the mean of its divisors is an integer number (5622955848).

Almost surely, 2^21242277631 is an apocalyptic number.

21242277631 is a deficient number, since it is larger than the sum of its proper divisors (1249545761).

21242277631 is a wasteful number, since it uses less digits than its factorization.

21242277631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249545760.

The product of its digits is 56448, while the sum is 37.

The spelling of 21242277631 in words is "twenty-one billion, two hundred forty-two million, two hundred seventy-seven thousand, six hundred thirty-one".