21549202 has 4 divisors (see below), whose sum is σ = 32323806. Its totient is φ = 10774600.

The previous prime is 21549197. The next prime is 21549221. The reversal of 21549202 is 20294512.

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., 21446161 + 103041 = 4631^2 + 321^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5387299 + ... + 5387302.

Almost surely, 2^21549202 is an apocalyptic number.

21549202 is a deficient number, since it is larger than the sum of its proper divisors (10774604).

21549202 is a wasteful number, since it uses less digits than its factorization.

21549202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10774603.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21549202 is about 4642.1118039099. Note that the first 3 decimals coincide. The cubic root of 21549202 is about 278.2768406587.

The spelling of 21549202 in words is "twenty-one million, five hundred forty-nine thousand, two hundred two".