31322101421 has 4 divisors (see below), whose sum is σ = 33731493852. Its totient is φ = 28912708992.

The previous prime is 31322101387. The next prime is 31322101429. The reversal of 31322101421 is 12410122313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12410122313 = 51203 ⋅242371.

It can be written as a sum of positive squares in 2 ways, for example, as 19171448521 + 12150652900 = 138461^2 + 110230^2 .

It is a cyclic number.

It is not a de Polignac number, because 31322101421 - 2¹⁴ = 31322085037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31322101393 and 31322101402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31322101429) 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, 1204696196 + ... + 1204696221.

It is an arithmetic number, because the mean of its divisors is an integer number (8432873463).

Almost surely, 2^31322101421 is an apocalyptic number.

It is an amenable number.

31322101421 is a deficient number, since it is larger than the sum of its proper divisors (2409392431).

31322101421 is a wasteful number, since it uses less digits than its factorization.

31322101421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409392430.

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

Adding to 31322101421 its reverse (12410122313), we get a palindrome (43732223734).

The spelling of 31322101421 in words is "thirty-one billion, three hundred twenty-two million, one hundred one thousand, four hundred twenty-one".