315220454421 has 4 divisors (see below), whose sum is σ = 420293939232. Its totient is φ = 210146969612.

The previous prime is 315220454371. The next prime is 315220454429. The reversal of 315220454421 is 124454022513.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124454022513 = 3 ⋅41484674171.

It is a cyclic number.

It is not a de Polignac number, because 315220454421 - 2⁷ = 315220454293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315220454429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52536742401 + ... + 52536742406.

It is an arithmetic number, because the mean of its divisors is an integer number (105073484808).

Almost surely, 2^315220454421 is an apocalyptic number.

It is an amenable number.

315220454421 is a deficient number, since it is larger than the sum of its proper divisors (105073484811).

315220454421 is a wasteful number, since it uses less digits than its factorization.

315220454421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105073484810.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 315220454421 its reverse (124454022513), we get a palindrome (439674476934).

The spelling of 315220454421 in words is "three hundred fifteen billion, two hundred twenty million, four hundred fifty-four thousand, four hundred twenty-one".