221898002 has 4 divisors (see below), whose sum is σ = 332847006. Its totient is φ = 110949000.

The previous prime is 221897999. The next prime is 221898007. The reversal of 221898002 is 200898122.

221898002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 200898122 = 2 ⋅100449061.

It can be written as a sum of positive squares in only one way, i.e., 177395761 + 44502241 = 13319^2 + 6671^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221898002.

It is not an unprimeable number, because it can be changed into a prime (221898007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55474499 + ... + 55474502.

Almost surely, 2^221898002 is an apocalyptic number.

221898002 is a deficient number, since it is larger than the sum of its proper divisors (110949004).

221898002 is a wasteful number, since it uses less digits than its factorization.

221898002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110949003.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 221898002 is about 14896.2412037400. The cubic root of 221898002 is about 605.4121472799.

The spelling of 221898002 in words is "two hundred twenty-one million, eight hundred ninety-eight thousand, two".