31402040221 has 12 divisors (see below), whose sum is σ = 33265071900. Its totient is φ = 29638617408.

The previous prime is 31402040207. The next prime is 31402040227. The reversal of 31402040221 is 12204020413.

It can be written as a sum of positive squares in 2 ways, for example, as 15341547321 + 16060492900 = 123861^2 + 126730^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31402040221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402040227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64576 + ... + 258793.

It is an arithmetic number, because the mean of its divisors is an integer number (2772089325).

Almost surely, 2^31402040221 is an apocalyptic number.

It is an amenable number.

31402040221 is a deficient number, since it is larger than the sum of its proper divisors (1863031679).

31402040221 is a wasteful number, since it uses less digits than its factorization.

31402040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323676 (or 323657 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 31402040221 its reverse (12204020413), we get a palindrome (43606060634).

The spelling of 31402040221 in words is "thirty-one billion, four hundred two million, forty thousand, two hundred twenty-one".