31121442101 has 4 divisors (see below), whose sum is σ = 31133318604. Its totient is φ = 31109565600.

The previous prime is 31121442061. The next prime is 31121442119. The reversal of 31121442101 is 10124412113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10124412113 = 23 ⋅440191831.

It can be written as a sum of positive squares in 2 ways, for example, as 12420879601 + 18700562500 = 111449^2 + 136750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121442101 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 (31121442161) 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, 5934320 + ... + 5939561.

It is an arithmetic number, because the mean of its divisors is an integer number (7783329651).

Almost surely, 2^31121442101 is an apocalyptic number.

It is an amenable number.

31121442101 is a deficient number, since it is larger than the sum of its proper divisors (11876503).

31121442101 is a wasteful number, since it uses less digits than its factorization.

31121442101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11876502.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 31121442101 its reverse (10124412113), we get a palindrome (41245854214).

The spelling of 31121442101 in words is "thirty-one billion, one hundred twenty-one million, four hundred forty-two thousand, one hundred one".