31242221135 has 32 divisors (see below), whose sum is σ = 39949189632. Its totient is φ = 23413501440.

The previous prime is 31242221119. The next prime is 31242221137. The reversal of 31242221135 is 53112224213.

It is not a de Polignac number, because 31242221135 - 2⁴ = 31242221119 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 (31242221137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1115969 + ... + 1143621.

It is an arithmetic number, because the mean of its divisors is an integer number (1248412176).

Almost surely, 2^31242221135 is an apocalyptic number.

31242221135 is a deficient number, since it is larger than the sum of its proper divisors (8706968497).

31242221135 is a wasteful number, since it uses less digits than its factorization.

31242221135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27923.

The product of its digits is 2880, while the sum is 26.

Adding to 31242221135 its reverse (53112224213), we get a palindrome (84354445348).

The spelling of 31242221135 in words is "thirty-one billion, two hundred forty-two million, two hundred twenty-one thousand, one hundred thirty-five".