31200020102213 has 4 divisors (see below), whose sum is σ = 31200589199340. Its totient is φ = 31199451005088.

The previous prime is 31200020102203. The next prime is 31200020102219. The reversal of 31200020102213 is 31220102000213.

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 9574525398529 + 21625494703684 = 3094273^2 + 4650322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31200020102213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31200020102191 and 31200020102200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200020102219) 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, 284466320 + ... + 284575977.

It is an arithmetic number, because the mean of its divisors is an integer number (7800147299835).

Almost surely, 2^{31200020102213} is an apocalyptic number.

It is an amenable number.

31200020102213 is a deficient number, since it is larger than the sum of its proper divisors (569097127).

31200020102213 is an equidigital number, since it uses as much as digits as its factorization.

31200020102213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569097126.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31200020102213 its reverse (31220102000213), we get a palindrome (62420122102426).

The spelling of 31200020102213 in words is "thirty-one trillion, two hundred billion, twenty million, one hundred two thousand, two hundred thirteen".