31301201221 has 4 divisors (see below), whose sum is σ = 31301815392. Its totient is φ = 31300587052.

The previous prime is 31301201161. The next prime is 31301201233. The reversal of 31301201221 is 12210210313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31301201221 - 2⁷ = 31301201093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31301201195 and 31301201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31301201291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222955 + ... + 335128.

It is an arithmetic number, because the mean of its divisors is an integer number (7825453848).

Almost surely, 2^31301201221 is an apocalyptic number.

It is an amenable number.

31301201221 is a deficient number, since it is larger than the sum of its proper divisors (614171).

31301201221 is an equidigital number, since it uses as much as digits as its factorization.

31301201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614170.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31301201221 its reverse (12210210313), we get a palindrome (43511411534).

The spelling of 31301201221 in words is "thirty-one billion, three hundred one million, two hundred one thousand, two hundred twenty-one".