31147898221 has 16 divisors (see below), whose sum is σ = 34330091328. Its totient is φ = 28024864000.

The previous prime is 31147898203. The next prime is 31147898227. The reversal of 31147898221 is 12289874113.

It is a cyclic number.

It is not a de Polignac number, because 31147898221 - 2¹³ = 31147890029 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 (31147898227) 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, 853470 + ... + 889216.

It is an arithmetic number, because the mean of its divisors is an integer number (2145630708).

Almost surely, 2^31147898221 is an apocalyptic number.

It is an amenable number.

31147898221 is a deficient number, since it is larger than the sum of its proper divisors (3182193107).

31147898221 is a wasteful number, since it uses less digits than its factorization.

31147898221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36572.

The product of its digits is 193536, while the sum is 46.

The spelling of 31147898221 in words is "thirty-one billion, one hundred forty-seven million, eight hundred ninety-eight thousand, two hundred twenty-one".