21890411 has 8 divisors (see below), whose sum is σ = 22986240. Its totient is φ = 20806632.

The previous prime is 21890383. The next prime is 21890417. The reversal of 21890411 is 11409812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21890411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21890417) 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, 830 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (2873280).

Almost surely, 2^21890411 is an apocalyptic number.

21890411 is a deficient number, since it is larger than the sum of its proper divisors (1095829).

21890411 is a wasteful number, since it uses less digits than its factorization.

21890411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6025.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 21890411 is about 4678.7189486012. The cubic root of 21890411 is about 279.7378967329.

The spelling of 21890411 in words is "twenty-one million, eight hundred ninety thousand, four hundred eleven".