221406142 has 8 divisors (see below), whose sum is σ = 346548816. Its totient is φ = 105889872.

The previous prime is 221406121. The next prime is 221406151. The reversal of 221406142 is 241604122.

It is a happy number.

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

It is a congruent number.

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, 2406543 + ... + 2406634.

It is an arithmetic number, because the mean of its divisors is an integer number (43318602).

Almost surely, 2^221406142 is an apocalyptic number.

221406142 is a deficient number, since it is larger than the sum of its proper divisors (125142674).

221406142 is a wasteful number, since it uses less digits than its factorization.

221406142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813202.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 221406142 is about 14879.7225108535. The cubic root of 221406142 is about 604.9644966986.

It can be divided in two parts, 22140 and 6142, that added together give a palindrome (28282).

The spelling of 221406142 in words is "two hundred twenty-one million, four hundred six thousand, one hundred forty-two".