31441221021 has 16 divisors (see below), whose sum is σ = 48349980800. Its totient is φ = 17801581248.

The previous prime is 31441221011. The next prime is 31441221059. The reversal of 31441221021 is 12012214413.

It is not a de Polignac number, because 31441221021 - 2⁵ = 31441220989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31441221011) 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 15 ways as a sum of consecutive naturals, for example, 6865606 + ... + 6870183.

It is an arithmetic number, because the mean of its divisors is an integer number (3021873800).

Almost surely, 2^31441221021 is an apocalyptic number.

It is an amenable number.

31441221021 is a deficient number, since it is larger than the sum of its proper divisors (16908759779).

31441221021 is a wasteful number, since it uses less digits than its factorization.

31441221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13735908.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 31441221021 its reverse (12012214413), we get a palindrome (43453435434).

The spelling of 31441221021 in words is "thirty-one billion, four hundred forty-one million, two hundred twenty-one thousand, twenty-one".