21425321631 has 8 divisors (see below), whose sum is σ = 32648109184. Its totient is φ = 12243040920.

The previous prime is 21425321591. The next prime is 21425321647. The reversal of 21425321631 is 13612352412.

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

It is not a de Polignac number, because 21425321631 - 2⁷ = 21425321503 is a prime.

It is a super-2 number, since 2×21425321631² (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 (21425341631) 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, 510126685 + ... + 510126726.

It is an arithmetic number, because the mean of its divisors is an integer number (4081013648).

Almost surely, 2^21425321631 is an apocalyptic number.

21425321631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21425321631 is a deficient number, since it is larger than the sum of its proper divisors (11222787553).

21425321631 is a wasteful number, since it uses less digits than its factorization.

21425321631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020253421.

The product of its digits is 8640, while the sum is 30.

The spelling of 21425321631 in words is "twenty-one billion, four hundred twenty-five million, three hundred twenty-one thousand, six hundred thirty-one".