221442140 has 24 divisors (see below), whose sum is σ = 466240320. Its totient is φ = 88346048.

The previous prime is 221442103. The next prime is 221442149. The reversal of 221442140 is 41244122.

221442140 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 (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221442149) 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, 6452 + ... + 22011.

It is an arithmetic number, because the mean of its divisors is an integer number (19426680).

Almost surely, 2^221442140 is an apocalyptic number.

221442140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221442140 is an abundant number, since it is smaller than the sum of its proper divisors (244798180).

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

221442140 is a wasteful number, since it uses less digits than its factorization.

221442140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28861 (or 28859 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 221442140 is about 14880.9320944624. The cubic root of 221442140 is about 604.9972815942.

Adding to 221442140 its reverse (41244122), we get a palindrome (262686262).

The spelling of 221442140 in words is "two hundred twenty-one million, four hundred forty-two thousand, one hundred forty".