31020030121 has 2 divisors, whose sum is σ = 31020030122. Its totient is φ = 31020030120.

The previous prime is 31020030091. The next prime is 31020030131. The reversal of 31020030121 is 12103002013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30879275625 + 140754496 = 175725^2 + 11864^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020030121 - 2⁵ = 31020030089 is a prime.

It is not a weakly prime, because it can be changed into another prime (31020030131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510015060 + 15510015061.

It is an arithmetic number, because the mean of its divisors is an integer number (15510015061).

Almost surely, 2^31020030121 is an apocalyptic number.

It is an amenable number.

31020030121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020030121 is an equidigital number, since it uses as much as digits as its factorization.

31020030121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31020030121 its reverse (12103002013), we get a palindrome (43123032134).

The spelling of 31020030121 in words is "thirty-one billion, twenty million, thirty thousand, one hundred twenty-one".