31021030230133 has 4 divisors (see below), whose sum is σ = 31181760956908. Its totient is φ = 30860299503360.

The previous prime is 31021030230103. The next prime is 31021030230161. The reversal of 31021030230133 is 33103203012013.

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 3029068738084 + 27991961492049 = 1740422^2 + 5290743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31021030230133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021030230103) 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, 80365363098 + ... + 80365363483.

It is an arithmetic number, because the mean of its divisors is an integer number (7795440239227).

Almost surely, 2^{31021030230133} is an apocalyptic number.

It is an amenable number.

31021030230133 is a deficient number, since it is larger than the sum of its proper divisors (160730726775).

31021030230133 is a wasteful number, since it uses less digits than its factorization.

31021030230133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160730726774.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31021030230133 its reverse (33103203012013), we get a palindrome (64124233242146).

The spelling of 31021030230133 in words is "thirty-one trillion, twenty-one billion, thirty million, two hundred thirty thousand, one hundred thirty-three".