31442122213 has 4 divisors (see below), whose sum is σ = 31840123840. Its totient is φ = 31044120588.

The previous prime is 31442122139. The next prime is 31442122223. The reversal of 31442122213 is 31222124413.

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 31442122213 - 2²¹ = 31440025061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442122223) 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, 199000695 + ... + 199000852.

It is an arithmetic number, because the mean of its divisors is an integer number (7960030960).

Almost surely, 2^31442122213 is an apocalyptic number.

It is an amenable number.

31442122213 is a deficient number, since it is larger than the sum of its proper divisors (398001627).

31442122213 is an equidigital number, since it uses as much as digits as its factorization.

31442122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398001626.

The product of its digits is 2304, while the sum is 25.

Adding to 31442122213 its reverse (31222124413), we get a palindrome (62664246626).

The spelling of 31442122213 in words is "thirty-one billion, four hundred forty-two million, one hundred twenty-two thousand, two hundred thirteen".