21903069 has 8 divisors (see below), whose sum is σ = 29427552. Its totient is φ = 14490320.

The previous prime is 21903059. The next prime is 21903073. The reversal of 21903069 is 96030912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21903069 - 2⁷ = 21902941 is a prime.

It is a super-2 number, since 2×21903069² = 959488863237522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21903059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27474 + ... + 28259.

It is an arithmetic number, because the mean of its divisors is an integer number (3678444).

Almost surely, 2^21903069 is an apocalyptic number.

It is an amenable number.

21903069 is a deficient number, since it is larger than the sum of its proper divisors (7524483).

21903069 is a wasteful number, since it uses less digits than its factorization.

21903069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55867.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 21903069 is about 4680.0714738132. The cubic root of 21903069 is about 279.7918052686.

The spelling of 21903069 in words is "twenty-one million, nine hundred three thousand, sixty-nine".