21903722 has 4 divisors (see below), whose sum is σ = 32855586. Its totient is φ = 10951860.

The previous prime is 21903719. The next prime is 21903733. The reversal of 21903722 is 22730912.

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., 21613201 + 290521 = 4649^2 + 539^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21903691 and 21903700.

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, 5475929 + ... + 5475932.

Almost surely, 2^21903722 is an apocalyptic number.

21903722 is a deficient number, since it is larger than the sum of its proper divisors (10951864).

21903722 is a wasteful number, since it uses less digits than its factorization.

21903722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10951863.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21903722 is about 4680.1412371850. The cubic root of 21903722 is about 279.7945857349.

The spelling of 21903722 in words is "twenty-one million, nine hundred three thousand, seven hundred twenty-two".