221151442 has 8 divisors (see below), whose sum is σ = 340692876. Its totient is φ = 107587152.

The previous prime is 221151433. The next prime is 221151443. The reversal of 221151442 is 244151122.

221151442 is digitally balanced in base 3, 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 211964481 + 9186961 = 14559^2 + 3031^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221151443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1494193 + ... + 1494340.

Almost surely, 2^221151442 is an apocalyptic number.

221151442 is a deficient number, since it is larger than the sum of its proper divisors (119541434).

221151442 is a wasteful number, since it uses less digits than its factorization.

221151442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2988572.

The product of its digits is 640, while the sum is 22.

The square root of 221151442 is about 14871.1614206826. The cubic root of 221151442 is about 604.7324290925.

The spelling of 221151442 in words is "two hundred twenty-one million, one hundred fifty-one thousand, four hundred forty-two".