221442102 has 96 divisors (see below), whose sum is σ = 589635072. Its totient is φ = 58620672.

The previous prime is 221442101. The next prime is 221442103. The reversal of 221442102 is 201244122.

221442102 is a `hidden beast` number, since 221 + 442 + 1 + 0 + 2 = 666.

221442102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221442101) and next prime (221442103).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221442101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142743 + ... + 144285.

It is an arithmetic number, because the mean of its divisors is an integer number (6142032).

Almost surely, 2^221442102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221442102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294817536).

221442102 is an abundant number, since it is smaller than the sum of its proper divisors (368192970).

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

221442102 is a wasteful number, since it uses less digits than its factorization.

221442102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221442102 is about 14880.9308176606. The cubic root of 221442102 is about 604.9972469879.

Adding to 221442102 its reverse (201244122), we get a palindrome (422686224).

The spelling of 221442102 in words is "two hundred twenty-one million, four hundred forty-two thousand, one hundred two".