31214011221 has 6 divisors (see below), whose sum is σ = 45086905110. Its totient is φ = 20809340808.

The previous prime is 31214011207. The next prime is 31214011247. The reversal of 31214011221 is 12211041213.

It can be written as a sum of positive squares in only one way, i.e., 20212308900 + 11001702321 = 142170^2 + 104889^2 .

It is not a de Polignac number, because 31214011221 - 2⁵ = 31214011189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31214011194 and 31214011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31214011201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1734111726 + ... + 1734111743.

It is an arithmetic number, because the mean of its divisors is an integer number (7514484185).

Almost surely, 2^31214011221 is an apocalyptic number.

It is an amenable number.

31214011221 is a deficient number, since it is larger than the sum of its proper divisors (13872893889).

31214011221 is a wasteful number, since it uses less digits than its factorization.

31214011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468223475 (or 3468223472 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 31214011221 its reverse (12211041213), we get a palindrome (43425052434).

The spelling of 31214011221 in words is "thirty-one billion, two hundred fourteen million, eleven thousand, two hundred twenty-one".