31202020121 has 8 divisors (see below), whose sum is σ = 31974125064. Its totient is φ = 30430442880.

The previous prime is 31202020103. The next prime is 31202020177. The reversal of 31202020121 is 12102020213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14679745600 + 16522274521 = 121160^2 + 128539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31202020121 - 2²⁶ = 31134911257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31202020096 and 31202020105.

It is not an unprimeable number, because it can be changed into a prime (31202020021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10850 + ... + 250043.

It is an arithmetic number, because the mean of its divisors is an integer number (3996765633).

Almost surely, 2^31202020121 is an apocalyptic number.

It is an amenable number.

31202020121 is a deficient number, since it is larger than the sum of its proper divisors (772104943).

31202020121 is a wasteful number, since it uses less digits than its factorization.

31202020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263851.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31202020121 its reverse (12102020213), we get a palindrome (43304040334).

The spelling of 31202020121 in words is "thirty-one billion, two hundred two million, twenty thousand, one hundred twenty-one".