221200542 has 12 divisors (see below), whose sum is σ = 479267880. Its totient is φ = 73733508.

The previous prime is 221200519. The next prime is 221200547. The reversal of 221200542 is 245002122.

221200542 is a `hidden beast` number, since 2 + 2 + 120 + 0 + 542 = 666.

221200542 is digitally balanced in base 2, because in such base 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 (18), and also a Moran number because the ratio is a prime number: 12288919 = 221200542 / (2 + 2 + 1 + 2 + 0 + 0 + 5 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6144442 + ... + 6144477.

It is an arithmetic number, because the mean of its divisors is an integer number (39938990).

Almost surely, 2^221200542 is an apocalyptic number.

221200542 is an abundant number, since it is smaller than the sum of its proper divisors (258067338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221200542 is a wasteful number, since it uses less digits than its factorization.

221200542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12288927 (or 12288924 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 221200542 is about 14872.8121752411. The cubic root of 221200542 is about 604.7771799727. Note that the first 3 decimals are identical.

Adding to 221200542 its reverse (245002122), we get a palindrome (466202664).

The spelling of 221200542 in words is "two hundred twenty-one million, two hundred thousand, five hundred forty-two".