31220403221 has 8 divisors (see below), whose sum is σ = 35705028864. Its totient is φ = 26741919600.

The previous prime is 31220403169. The next prime is 31220403239. The reversal of 31220403221 is 12230402213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31220403221 - 2⁶ = 31220403157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220403193 and 31220403202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220403281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1524605 + ... + 1544946.

It is an arithmetic number, because the mean of its divisors is an integer number (4463128608).

Almost surely, 2^31220403221 is an apocalyptic number.

It is an amenable number.

31220403221 is a deficient number, since it is larger than the sum of its proper divisors (4484625643).

31220403221 is a wasteful number, since it uses less digits than its factorization.

31220403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071011.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31220403221 its reverse (12230402213), we get a palindrome (43450805434).

The spelling of 31220403221 in words is "thirty-one billion, two hundred twenty million, four hundred three thousand, two hundred twenty-one".