31220200221 has 16 divisors (see below), whose sum is σ = 48353536128. Its totient is φ = 17547652800.

The previous prime is 31220200211. The next prime is 31220200229. The reversal of 31220200221 is 12200202213.

It is a happy number.

It is not a de Polignac number, because 31220200221 - 2⁹ = 31220199709 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220200229) 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, 12184590 + ... + 12187151.

It is an arithmetic number, because the mean of its divisors is an integer number (3022096008).

Almost surely, 2^31220200221 is an apocalyptic number.

It is an amenable number.

31220200221 is a deficient number, since it is larger than the sum of its proper divisors (17133335907).

31220200221 is a wasteful number, since it uses less digits than its factorization.

31220200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24371812.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 31220200221 its reverse (12200202213), we get a palindrome (43420402434).

The spelling of 31220200221 in words is "thirty-one billion, two hundred twenty million, two hundred thousand, two hundred twenty-one".