21900927 has 8 divisors (see below), whose sum is σ = 29223040. Its totient is φ = 14589720.

The previous prime is 21900883. The next prime is 21900937. The reversal of 21900927 is 72900912.

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

It is a de Polignac number, because none of the positive numbers 2^k-21900927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21900894 and 21900903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900937) 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, 5574 + ... + 8652.

It is an arithmetic number, because the mean of its divisors is an integer number (3652880).

Almost surely, 2^21900927 is an apocalyptic number.

21900927 is a deficient number, since it is larger than the sum of its proper divisors (7322113).

21900927 is a wasteful number, since it uses less digits than its factorization.

21900927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 21900927 is about 4679.8426255591. The cubic root of 21900927 is about 279.7826842701.

The spelling of 21900927 in words is "twenty-one million, nine hundred thousand, nine hundred twenty-seven".