31440214121 has 4 divisors (see below), whose sum is σ = 31470129744. Its totient is φ = 31410298500.

The previous prime is 31440214097. The next prime is 31440214177. The reversal of 31440214121 is 12141204413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31440214121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31440214621) 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, 14956235 + ... + 14958336.

It is an arithmetic number, because the mean of its divisors is an integer number (7867532436).

Almost surely, 2^31440214121 is an apocalyptic number.

It is an amenable number.

31440214121 is a deficient number, since it is larger than the sum of its proper divisors (29915623).

31440214121 is a wasteful number, since it uses less digits than its factorization.

31440214121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29915622.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 31440214121 its reverse (12141204413), we get a palindrome (43581418534).

The spelling of 31440214121 in words is "thirty-one billion, four hundred forty million, two hundred fourteen thousand, one hundred twenty-one".