31412551221 has 32 divisors (see below), whose sum is σ = 47994552320. Its totient is φ = 20293528752.

The previous prime is 31412551217. The next prime is 31412551237. The reversal of 31412551221 is 12215521413.

It is a happy number.

31412551221 is a `hidden beast` number, since 3 + 1 + 4 + 125 + 512 + 21 = 666.

It is not a de Polignac number, because 31412551221 - 2² = 31412551217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31412551201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40926 + ... + 253968.

It is an arithmetic number, because the mean of its divisors is an integer number (1499829760).

Almost surely, 2^31412551221 is an apocalyptic number.

It is an amenable number.

31412551221 is a deficient number, since it is larger than the sum of its proper divisors (16582001099).

31412551221 is a wasteful number, since it uses less digits than its factorization.

31412551221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213222 (or 213216 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The spelling of 31412551221 in words is "thirty-one billion, four hundred twelve million, five hundred fifty-one thousand, two hundred twenty-one".