21900202 has 4 divisors (see below), whose sum is σ = 32850306. Its totient is φ = 10950100.

The previous prime is 21900181. The next prime is 21900227. The reversal of 21900202 is 20200912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18481401 + 3418801 = 4299^2 + 1849^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5475049 + ... + 5475052.

Almost surely, 2^21900202 is an apocalyptic number.

21900202 is a deficient number, since it is larger than the sum of its proper divisors (10950104).

21900202 is a wasteful number, since it uses less digits than its factorization.

21900202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950103.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21900202 is about 4679.7651650483. The cubic root of 21900202 is about 279.7795969626.

The spelling of 21900202 in words is "twenty-one million, nine hundred thousand, two hundred two".