221402838 has 16 divisors (see below), whose sum is σ = 446187456. Its totient is φ = 73237320.

The previous prime is 221402827. The next prime is 221402873. The reversal of 221402838 is 838204122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140056 + ... + 141627.

It is an arithmetic number, because the mean of its divisors is an integer number (27886716).

Almost surely, 2^221402838 is an apocalyptic number.

221402838 is an abundant number, since it is smaller than the sum of its proper divisors (224784618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221402838 is a wasteful number, since it uses less digits than its factorization.

221402838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281819.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 221402838 is about 14879.6114868635. The cubic root of 221402838 is about 604.9614874285.

The spelling of 221402838 in words is "two hundred twenty-one million, four hundred two thousand, eight hundred thirty-eight".