31220251055345 has 16 divisors (see below), whose sum is σ = 40888159404480. Its totient is φ = 22695630148800.

The previous prime is 31220251055321. The next prime is 31220251055347. The reversal of 31220251055345 is 54355015202213.

It is a de Polignac number, because none of the positive numbers 2^k-31220251055345 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31220251055299 and 31220251055308.

It is not an unprimeable number, because it can be changed into a prime (31220251055347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124961351 + ... + 125210940.

It is an arithmetic number, because the mean of its divisors is an integer number (2555509962780).

Almost surely, 2^{31220251055345} is an apocalyptic number.

It is an amenable number.

31220251055345 is a deficient number, since it is larger than the sum of its proper divisors (9667908349135).

31220251055345 is a wasteful number, since it uses less digits than its factorization.

31220251055345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250174576.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 31220251055345 its reverse (54355015202213), we get a palindrome (85575266257558).

The spelling of 31220251055345 in words is "thirty-one trillion, two hundred twenty billion, two hundred fifty-one million, fifty-five thousand, three hundred forty-five".