21903701 has 16 divisors (see below), whose sum is σ = 24261120. Its totient is φ = 19683840.

The previous prime is 21903683. The next prime is 21903709. The reversal of 21903701 is 10730912.

It is a cyclic number.

It is not a de Polignac number, because 21903701 - 2²² = 17709397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21903709) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 46670 + ... + 47136.

It is an arithmetic number, because the mean of its divisors is an integer number (1516320).

Almost surely, 2^21903701 is an apocalyptic number.

It is an amenable number.

21903701 is a deficient number, since it is larger than the sum of its proper divisors (2357419).

21903701 is a wasteful number, since it uses less digits than its factorization.

21903701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 21903701 is about 4680.1389936625. The cubic root of 21903701 is about 279.7944963180.

The spelling of 21903701 in words is "twenty-one million, nine hundred three thousand, seven hundred one".