221002144 has 36 divisors (see below), whose sum is σ = 478256562. Its totient is φ = 100453760.

The previous prime is 221002121. The next prime is 221002151. The reversal of 221002144 is 441200122.

It can be written as a sum of positive squares in only one way, i.e., 207014544 + 13987600 = 14388^2 + 3740^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24667 + ... + 32410.

Almost surely, 2^221002144 is an apocalyptic number.

It is an amenable number.

221002144 is an abundant number, since it is smaller than the sum of its proper divisors (257254418).

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

221002144 is a wasteful number, since it uses less digits than its factorization.

221002144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57109 (or 57090 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221002144 is about 14866.1408576671. The cubic root of 221002144 is about 604.5963147236.

Adding to 221002144 its reverse (441200122), we get a palindrome (662202266).

The spelling of 221002144 in words is "two hundred twenty-one million, two thousand, one hundred forty-four".