221438858 has 8 divisors (see below), whose sum is σ = 341135652. Its totient is φ = 107726976.

The previous prime is 221438831. The next prime is 221438869. The reversal of 221438858 is 858834122.

221438858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 218064289 + 3374569 = 14767^2 + 1837^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1496135 + ... + 1496282.

Almost surely, 2^221438858 is an apocalyptic number.

221438858 is a deficient number, since it is larger than the sum of its proper divisors (119696794).

221438858 is a wasteful number, since it uses less digits than its factorization.

221438858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992456.

The product of its digits is 122880, while the sum is 41.

The square root of 221438858 is about 14880.8218187034. The cubic root of 221438858 is about 604.9942926857.

The spelling of 221438858 in words is "two hundred twenty-one million, four hundred thirty-eight thousand, eight hundred fifty-eight".