221389142 has 16 divisors (see below), whose sum is σ = 359489760. Its totient is φ = 101647872.

The previous prime is 221389139. The next prime is 221389151. The reversal of 221389142 is 241983122.

It is a junction number, because it is equal to n+sod(n) for n = 221389099 and 221389108.

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, 17042 + ... + 27077.

It is an arithmetic number, because the mean of its divisors is an integer number (22468110).

Almost surely, 2^221389142 is an apocalyptic number.

221389142 is a deficient number, since it is larger than the sum of its proper divisors (138100618).

221389142 is a wasteful number, since it uses less digits than its factorization.

221389142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44327.

The product of its digits is 6912, while the sum is 32.

The square root of 221389142 is about 14879.1512526757. The cubic root of 221389142 is about 604.9490128468.

The spelling of 221389142 in words is "two hundred twenty-one million, three hundred eighty-nine thousand, one hundred forty-two".