31347601221 has 4 divisors (see below), whose sum is σ = 41796801632. Its totient is φ = 20898400812.

The previous prime is 31347601147. The next prime is 31347601223. The reversal of 31347601221 is 12210674313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12210674313 = 3 ⋅4070224771.

It is not a de Polignac number, because 31347601221 - 2¹⁴ = 31347584837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31347601223) 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, 5224600201 + ... + 5224600206.

It is an arithmetic number, because the mean of its divisors is an integer number (10449200408).

Almost surely, 2^31347601221 is an apocalyptic number.

It is an amenable number.

31347601221 is a deficient number, since it is larger than the sum of its proper divisors (10449200411).

31347601221 is a wasteful number, since it uses less digits than its factorization.

31347601221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449200410.

The product of its (nonzero) digits is 6048, while the sum is 30.

The spelling of 31347601221 in words is "thirty-one billion, three hundred forty-seven million, six hundred one thousand, two hundred twenty-one".