223870355721 has 12 divisors (see below), whose sum is σ = 337427782848. Its totient is φ = 142757907864.

The previous prime is 223870355717. The next prime is 223870355729. The reversal of 223870355721 is 127553078322.

223870355721 is a `hidden beast` number, since 2 + 2 + 3 + 8 + 70 + 3 + 5 + 572 + 1 = 666.

It is not a de Polignac number, because 223870355721 - 2² = 223870355717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (223870355729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540749445 + ... + 540749858.

It is an arithmetic number, because the mean of its divisors is an integer number (28118981904).

Almost surely, 2^223870355721 is an apocalyptic number.

It is an amenable number.

223870355721 is a deficient number, since it is larger than the sum of its proper divisors (113557427127).

223870355721 is a wasteful number, since it uses less digits than its factorization.

223870355721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081499332 (or 1081499329 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 223870355721 in words is "two hundred twenty-three billion, eight hundred seventy million, three hundred fifty-five thousand, seven hundred twenty-one".