31133311513421 has 4 divisors (see below), whose sum is σ = 33528181629852. Its totient is φ = 28738441396992.

The previous prime is 31133311513417. The next prime is 31133311513427. The reversal of 31133311513421 is 12431511333113.

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 17347974708100 + 13785336805321 = 4165090^2 + 3712861^2 .

It is a cyclic number.

It is not a de Polignac number, because 31133311513421 - 2² = 31133311513417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133311513427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197435058196 + ... + 1197435058221.

It is an arithmetic number, because the mean of its divisors is an integer number (8382045407463).

Almost surely, 2^{31133311513421} is an apocalyptic number.

It is an amenable number.

31133311513421 is a deficient number, since it is larger than the sum of its proper divisors (2394870116431).

31133311513421 is a wasteful number, since it uses less digits than its factorization.

31133311513421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394870116430.

The product of its digits is 9720, while the sum is 32.

Adding to 31133311513421 its reverse (12431511333113), we get a palindrome (43564822846534).

The spelling of 31133311513421 in words is "thirty-one trillion, one hundred thirty-three billion, three hundred eleven million, five hundred thirteen thousand, four hundred twenty-one".