21075202 has 4 divisors (see below), whose sum is σ = 31612806. Its totient is φ = 10537600.

The previous prime is 21075181. The next prime is 21075217. The reversal of 21075202 is 20257012.

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., 14830201 + 6245001 = 3851^2 + 2499^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21075202.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5268799 + ... + 5268802.

Almost surely, 2^21075202 is an apocalyptic number.

21075202 is a deficient number, since it is larger than the sum of its proper divisors (10537604).

21075202 is a wasteful number, since it uses less digits than its factorization.

21075202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10537603.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21075202 is about 4590.7735731574. The cubic root of 21075202 is about 276.2213532671.

The spelling of 21075202 in words is "twenty-one million, seventy-five thousand, two hundred two".