315445302155221 has 192 divisors, whose sum is σ = 407339128627200. Its totient is φ = 238862472307200.

The previous prime is 315445302155201. The next prime is 315445302155239. The reversal of 315445302155221 is 122551203544513.

It is a de Polignac number, because none of the positive numbers 2^k-315445302155221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315445302155201) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 83473219110 + ... + 83473222888.

It is an arithmetic number, because the mean of its divisors is an integer number (2121557961600).

Almost surely, 2^{315445302155221} is an apocalyptic number.

It is an amenable number.

315445302155221 is a deficient number, since it is larger than the sum of its proper divisors (91893826471979).

315445302155221 is a wasteful number, since it uses less digits than its factorization.

315445302155221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4248 (or 4229 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 43.

Adding to 315445302155221 its reverse (122551203544513), we get a palindrome (437996505699734).

The spelling of 315445302155221 in words is "three hundred fifteen trillion, four hundred forty-five billion, three hundred two million, one hundred fifty-five thousand, two hundred twenty-one".