221051042 has 4 divisors (see below), whose sum is σ = 331576566. Its totient is φ = 110525520.

The previous prime is 221051041. The next prime is 221051059. The reversal of 221051042 is 240150122.

221051042 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240150122 = 2 ⋅120075061.

It can be written as a sum of positive squares in only one way, i.e., 131767441 + 89283601 = 11479^2 + 9449^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221051042.

It is not an unprimeable number, because it can be changed into a prime (221051041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55262759 + ... + 55262762.

Almost surely, 2^221051042 is an apocalyptic number.

221051042 is a deficient number, since it is larger than the sum of its proper divisors (110525524).

221051042 is a wasteful number, since it uses less digits than its factorization.

221051042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110525523.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 221051042 is about 14867.7853764439. The cubic root of 221051042 is about 604.6409015769.

The spelling of 221051042 in words is "two hundred twenty-one million, fifty-one thousand, forty-two".