31220100321 has 8 divisors (see below), whose sum is σ = 42128328480. Its totient is φ = 20562636192.

The previous prime is 31220100293. The next prime is 31220100343. The reversal of 31220100321 is 12300102213.

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

It is not a de Polignac number, because 31220100321 - 2⁷ = 31220100193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31220100321.

It is not an unprimeable number, because it can be changed into a prime (31220100361) 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 7 ways as a sum of consecutive naturals, for example, 62690716 + ... + 62691213.

It is an arithmetic number, because the mean of its divisors is an integer number (5266041060).

Almost surely, 2^31220100321 is an apocalyptic number.

It is an amenable number.

31220100321 is a deficient number, since it is larger than the sum of its proper divisors (10908228159).

31220100321 is a wasteful number, since it uses less digits than its factorization.

31220100321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125382015.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31220100321 its reverse (12300102213), we get a palindrome (43520202534).

The spelling of 31220100321 in words is "thirty-one billion, two hundred twenty million, one hundred thousand, three hundred twenty-one".