31420222121 has 4 divisors (see below), whose sum is σ = 32186569044. Its totient is φ = 30653875200.

The previous prime is 31420222079. The next prime is 31420222133. The reversal of 31420222121 is 12122202413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1220733721 + 30199488400 = 34939^2 + 173780^2 .

It is a cyclic number.

It is not a de Polignac number, because 31420222121 - 2¹⁰ = 31420221097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31420222093 and 31420222102.

It is not an unprimeable number, because it can be changed into a prime (31420222151) 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, 383173400 + ... + 383173481.

It is an arithmetic number, because the mean of its divisors is an integer number (8046642261).

Almost surely, 2^31420222121 is an apocalyptic number.

It is an amenable number.

31420222121 is a deficient number, since it is larger than the sum of its proper divisors (766346923).

31420222121 is an equidigital number, since it uses as much as digits as its factorization.

31420222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766346922.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31420222121 its reverse (12122202413), we get a palindrome (43542424534).

The spelling of 31420222121 in words is "thirty-one billion, four hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".