31121422432355 has 4 divisors (see below), whose sum is σ = 37345706918832. Its totient is φ = 24897137945880.

The previous prime is 31121422432349. The next prime is 31121422432361. The reversal of 31121422432355 is 55323422412113.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (31121422432349) and next prime (31121422432361).

It is not a de Polignac number, because 31121422432355 - 2⁴ = 31121422432339 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3112142243231 + ... + 3112142243240.

It is an arithmetic number, because the mean of its divisors is an integer number (9336426729708).

Almost surely, 2^{31121422432355} is an apocalyptic number.

31121422432355 is a deficient number, since it is larger than the sum of its proper divisors (6224284486477).

31121422432355 is an equidigital number, since it uses as much as digits as its factorization.

31121422432355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6224284486476.

The product of its digits is 172800, while the sum is 38.

Adding to 31121422432355 its reverse (55323422412113), we get a palindrome (86444844844468).

The spelling of 31121422432355 in words is "thirty-one trillion, one hundred twenty-one billion, four hundred twenty-two million, four hundred thirty-two thousand, three hundred fifty-five".