31200130121 has 4 divisors (see below), whose sum is σ = 31211482500. Its totient is φ = 31188777744.

The previous prime is 31200130081. The next prime is 31200130187. The reversal of 31200130121 is 12103100213.

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 6090241600 + 25109888521 = 78040^2 + 158461^2 .

It is a cyclic number.

It is not a de Polignac number, because 31200130121 - 2²² = 31195935817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31200130096 and 31200130105.

It is not an unprimeable number, because it can be changed into a prime (31200135121) 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, 5672066 + ... + 5677563.

It is an arithmetic number, because the mean of its divisors is an integer number (7802870625).

Almost surely, 2^31200130121 is an apocalyptic number.

It is an amenable number.

31200130121 is a deficient number, since it is larger than the sum of its proper divisors (11352379).

31200130121 is a wasteful number, since it uses less digits than its factorization.

31200130121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11352378.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31200130121 its reverse (12103100213), we get a palindrome (43303230334).

The spelling of 31200130121 in words is "thirty-one billion, two hundred million, one hundred thirty thousand, one hundred twenty-one".