218350556421 has 8 divisors (see below), whose sum is σ = 291162022080. Its totient is φ = 145553064192.

The previous prime is 218350556383. The next prime is 218350556441. The reversal of 218350556421 is 124655053812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218350556421 - 2³¹ = 216203072773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218350556441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3456841 + ... + 3519438.

It is an arithmetic number, because the mean of its divisors is an integer number (36395252760).

Almost surely, 2^218350556421 is an apocalyptic number.

It is an amenable number.

218350556421 is a deficient number, since it is larger than the sum of its proper divisors (72811465659).

218350556421 is a wasteful number, since it uses less digits than its factorization.

218350556421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6986715.

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 218350556421 in words is "two hundred eighteen billion, three hundred fifty million, five hundred fifty-six thousand, four hundred twenty-one".