21903371 has 16 divisors (see below), whose sum is σ = 27068160. Its totient is φ = 17301600.

The previous prime is 21903359. The next prime is 21903379. The reversal of 21903371 is 17330912.

It is a cyclic number.

It is not a de Polignac number, because 21903371 - 2¹⁰ = 21902347 is a prime.

It is a super-2 number, since 2×21903371² = 959515322327282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21903371.

It is not an unprimeable number, because it can be changed into a prime (21903379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2696 + ... + 7146.

It is an arithmetic number, because the mean of its divisors is an integer number (1691760).

Almost surely, 2^21903371 is an apocalyptic number.

21903371 is a deficient number, since it is larger than the sum of its proper divisors (5164789).

21903371 is a wasteful number, since it uses less digits than its factorization.

21903371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4514.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 21903371 is about 4680.1037381665. The cubic root of 21903371 is about 279.7930911879.

The spelling of 21903371 in words is "twenty-one million, nine hundred three thousand, three hundred seventy-one".