31220223213 has 16 divisors (see below), whose sum is σ = 41725556352. Its totient is φ = 20764224000.

The previous prime is 31220223107. The next prime is 31220223239. The reversal of 31220223213 is 31232202213.

It is a happy number.

It is not a de Polignac number, because 31220223213 - 2¹⁶ = 31220157677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31220223213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220223263) 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, 6610693 + ... + 6615413.

It is an arithmetic number, because the mean of its divisors is an integer number (2607847272).

Almost surely, 2^31220223213 is an apocalyptic number.

It is an amenable number.

31220223213 is a deficient number, since it is larger than the sum of its proper divisors (10505333139).

31220223213 is a wasteful number, since it uses less digits than its factorization.

31220223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9476.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31220223213 its reverse (31232202213), we get a palindrome (62452425426).

The spelling of 31220223213 in words is "thirty-one billion, two hundred twenty million, two hundred twenty-three thousand, two hundred thirteen".