31020232021 has 2 divisors, whose sum is σ = 31020232022. Its totient is φ = 31020232020.

The previous prime is 31020231947. The next prime is 31020232049. The reversal of 31020232021 is 12023202013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21546129796 + 9474102225 = 146786^2 + 97335^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020232021 - 2²⁹ = 30483361109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31020231986 and 31020232004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31020232051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510116010 + 15510116011.

It is an arithmetic number, because the mean of its divisors is an integer number (15510116011).

Almost surely, 2^31020232021 is an apocalyptic number.

It is an amenable number.

31020232021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020232021 is an equidigital number, since it uses as much as digits as its factorization.

31020232021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31020232021 its reverse (12023202013), we get a palindrome (43043434034).

The spelling of 31020232021 in words is "thirty-one billion, twenty million, two hundred thirty-two thousand, twenty-one".