31121220300001 has 4 divisors (see below), whose sum is σ = 33515160323092. Its totient is φ = 28727280276912.

The previous prime is 31121220299933. The next prime is 31121220300007. The reversal of 31121220300001 is 10000302212113.

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 4422545910225 + 26698674389776 = 2102985^2 + 5167076^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121220300001 - 2¹³ = 31121220291809 is a prime.

It is a super-2 number, since 2×31121220300001² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121220300007) 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, 1196970011526 + ... + 1196970011551.

It is an arithmetic number, because the mean of its divisors is an integer number (8378790080773).

Almost surely, 2^{31121220300001} is an apocalyptic number.

It is an amenable number.

31121220300001 is a deficient number, since it is larger than the sum of its proper divisors (2393940023091).

31121220300001 is a wasteful number, since it uses less digits than its factorization.

31121220300001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393940023090.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31121220300001 its reverse (10000302212113), we get a palindrome (41121522512114).

The spelling of 31121220300001 in words is "thirty-one trillion, one hundred twenty-one billion, two hundred twenty million, three hundred thousand, one".