31200121 has 8 divisors (see below), whose sum is σ = 32626944. Its totient is φ = 29779200.

The previous prime is 31200089. The next prime is 31200137. The reversal of 31200121 is 12100213.

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 31200121 - 2⁵ = 31200089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31200098 and 31200107.

It is not an unprimeable number, because it can be changed into a prime (31203121) 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, 12096 + ... + 14446.

It is an arithmetic number, because the mean of its divisors is an integer number (4078368).

Almost surely, 2^31200121 is an apocalyptic number.

It is an amenable number.

31200121 is a deficient number, since it is larger than the sum of its proper divisors (1426823).

31200121 is a wasteful number, since it uses less digits than its factorization.

31200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 31200121 is about 5585.7068487345. The cubic root of 31200121 is about 314.8125902945.

Adding to 31200121 its reverse (12100213), we get a palindrome (43300334).

The spelling of 31200121 in words is "thirty-one million, two hundred thousand, one hundred twenty-one".