31021420321 has 8 divisors (see below), whose sum is σ = 32095351080. Its totient is φ = 29947771392.

The previous prime is 31021420273. The next prime is 31021420333. The reversal of 31021420321 is 12302412013.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1199929600 + 29821490721 = 34640^2 + 172689^2 .

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 31021420321 - 2¹⁷ = 31021289249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31021427321) 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, 167121 + ... + 299953.

It is an arithmetic number, because the mean of its divisors is an integer number (4011918885).

Almost surely, 2^31021420321 is an apocalyptic number.

It is an amenable number.

31021420321 is a deficient number, since it is larger than the sum of its proper divisors (1073930759).

31021420321 is a wasteful number, since it uses less digits than its factorization.

31021420321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140915.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31021420321 its reverse (12302412013), we get a palindrome (43323832334).

The spelling of 31021420321 in words is "thirty-one billion, twenty-one million, four hundred twenty thousand, three hundred twenty-one".