31421320231 has 8 divisors (see below), whose sum is σ = 35912478240. Its totient is φ = 26930761728.

The previous prime is 31421320223. The next prime is 31421320241. The reversal of 31421320231 is 13202312413.

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 31421320231 - 2³ = 31421320223 is a prime.

It is a super-2 number, since 2×31421320231² (a number of 22 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 (31421320241) 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, 31306 + ... + 252631.

It is an arithmetic number, because the mean of its divisors is an integer number (4489059780).

Almost surely, 2^31421320231 is an apocalyptic number.

31421320231 is a deficient number, since it is larger than the sum of its proper divisors (4491158009).

31421320231 is a wasteful number, since it uses less digits than its factorization.

31421320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299753.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31421320231 its reverse (13202312413), we get a palindrome (44623632644).

The spelling of 31421320231 in words is "thirty-one billion, four hundred twenty-one million, three hundred twenty thousand, two hundred thirty-one".