21752902 has 4 divisors (see below), whose sum is σ = 32629356. Its totient is φ = 10876450.

The previous prime is 21752893. The next prime is 21752921. The reversal of 21752902 is 20925712.

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

It is a congruent number.

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, 5438224 + ... + 5438227.

It is an arithmetic number, because the mean of its divisors is an integer number (8157339).

Almost surely, 2^21752902 is an apocalyptic number.

21752902 is a deficient number, since it is larger than the sum of its proper divisors (10876454).

21752902 is a wasteful number, since it uses less digits than its factorization.

21752902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10876453.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 21752902 is about 4664.0006432247. Note that the first 3 decimals coincide. The cubic root of 21752902 is about 279.1509227427.

The spelling of 21752902 in words is "twenty-one million, seven hundred fifty-two thousand, nine hundred two".