221807542 has 16 divisors (see below), whose sum is σ = 374667264. Its totient is φ = 97569000.

The previous prime is 221807533. The next prime is 221807549. The reversal of 221807542 is 245708122.

It is a happy number.

221807542 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 Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221807549) 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, 161934 + ... + 163297.

It is an arithmetic number, because the mean of its divisors is an integer number (23416704).

Almost surely, 2^221807542 is an apocalyptic number.

221807542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221807542 is a deficient number, since it is larger than the sum of its proper divisors (152859722).

221807542 is a wasteful number, since it uses less digits than its factorization.

221807542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325275.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 221807542 is about 14893.2045577841. The cubic root of 221807542 is about 605.3298676949.

The spelling of 221807542 in words is "two hundred twenty-one million, eight hundred seven thousand, five hundred forty-two".