221529142 has 16 divisors (see below), whose sum is σ = 359328960. Its totient is φ = 102030208.

The previous prime is 221529103. The next prime is 221529149. The reversal of 221529142 is 241925122.

It is a self number, because there is not a number n which added to its sum of digits gives 221529142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221529149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67717 + ... + 70912.

It is an arithmetic number, because the mean of its divisors is an integer number (22458060).

Almost surely, 2^221529142 is an apocalyptic number.

221529142 is a deficient number, since it is larger than the sum of its proper divisors (137799818).

221529142 is a wasteful number, since it uses less digits than its factorization.

221529142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138695.

The product of its digits is 2880, while the sum is 28.

The square root of 221529142 is about 14883.8550785742. The cubic root of 221529142 is about 605.0765033143.

The spelling of 221529142 in words is "two hundred twenty-one million, five hundred twenty-nine thousand, one hundred forty-two".