31400331221 has 16 divisors (see below), whose sum is σ = 36064051200. Its totient is φ = 26781277488.

The previous prime is 31400331199. The next prime is 31400331229. The reversal of 31400331221 is 12213300413.

It is a de Polignac number, because none of the positive numbers 2^k-31400331221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31400331193 and 31400331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400331229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2400926 + ... + 2413968.

It is an arithmetic number, because the mean of its divisors is an integer number (2254003200).

Almost surely, 2^31400331221 is an apocalyptic number.

It is an amenable number.

31400331221 is a deficient number, since it is larger than the sum of its proper divisors (4663719979).

31400331221 is a wasteful number, since it uses less digits than its factorization.

31400331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14728.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31400331221 its reverse (12213300413), we get a palindrome (43613631634).

The spelling of 31400331221 in words is "thirty-one billion, four hundred million, three hundred thirty-one thousand, two hundred twenty-one".