31120012302221 has 4 divisors (see below), whose sum is σ = 31230759677244. Its totient is φ = 31009264927200.

The previous prime is 31120012302173. The next prime is 31120012302241. The reversal of 31120012302221 is 12220321002113.

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 21441622860100 + 9678389442121 = 4630510^2 + 3111011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31120012302221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31120012302193 and 31120012302202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120012302241) 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, 55373687090 + ... + 55373687651.

It is an arithmetic number, because the mean of its divisors is an integer number (7807689919311).

Almost surely, 2^{31120012302221} is an apocalyptic number.

It is an amenable number.

31120012302221 is a deficient number, since it is larger than the sum of its proper divisors (110747375023).

31120012302221 is a wasteful number, since it uses less digits than its factorization.

31120012302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110747375022.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31120012302221 its reverse (12220321002113), we get a palindrome (43340333304334).

The spelling of 31120012302221 in words is "thirty-one trillion, one hundred twenty billion, twelve million, three hundred two thousand, two hundred twenty-one".