102221442 has 24 divisors (see below), whose sum is σ = 234508716. Its totient is φ = 32069376.

The previous prime is 102221437. The next prime is 102221447. The reversal of 102221442 is 244122201.

102221442 is a `hidden beast` number, since 1 + 0 + 2 + 221 + 442 = 666.

It is an interprime number because it is at equal distance from previous prime (102221437) and next prime (102221447).

It can be written as a sum of positive squares in 2 ways, for example, as 97594641 + 4626801 = 9879^2 + 2151^2 .

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

It is not an unprimeable number, because it can be changed into a prime (102221447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166723 + ... + 167334.

Almost surely, 2^102221442 is an apocalyptic number.

102221442 is an abundant number, since it is smaller than the sum of its proper divisors (132287274).

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

102221442 is a wasteful number, since it uses less digits than its factorization.

102221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334082 (or 334079 counting only the distinct ones).

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

The square root of 102221442 is about 10110.4620072477. The cubic root of 102221442 is about 467.5707492991.

Adding to 102221442 its reverse (244122201), we get a palindrome (346343643).

It can be divided in two parts, 10222 and 1442, that added together give a square (11664 = 108²).

The spelling of 102221442 in words is "one hundred two million, two hundred twenty-one thousand, four hundred forty-two".