31232022121 has 4 divisors (see below), whose sum is σ = 31288094532. Its totient is φ = 31175949712.

The previous prime is 31232022077. The next prime is 31232022131. The reversal of 31232022121 is 12122023213.

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 4087812096 + 27144210025 = 63936^2 + 164755^2 .

It is a cyclic number.

It is not a de Polignac number, because 31232022121 - 2²⁵ = 31198467689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31232022131) 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, 28035370 + ... + 28036483.

It is an arithmetic number, because the mean of its divisors is an integer number (7822023633).

Almost surely, 2^31232022121 is an apocalyptic number.

It is an amenable number.

31232022121 is a deficient number, since it is larger than the sum of its proper divisors (56072411).

31232022121 is an equidigital number, since it uses as much as digits as its factorization.

31232022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56072410.

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

Adding to 31232022121 its reverse (12122023213), we get a palindrome (43354045334).

The spelling of 31232022121 in words is "thirty-one billion, two hundred thirty-two million, twenty-two thousand, one hundred twenty-one".