21790411 has 8 divisors (see below), whose sum is σ = 22271040. Its totient is φ = 21313608.

The previous prime is 21790403. The next prime is 21790421. The reversal of 21790411 is 11409712.

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 21790411 - 2³ = 21790403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21790421) 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, 12580 + ... + 14206.

It is an arithmetic number, because the mean of its divisors is an integer number (2783880).

Almost surely, 2^21790411 is an apocalyptic number.

21790411 is a deficient number, since it is larger than the sum of its proper divisors (480629).

21790411 is a wasteful number, since it uses less digits than its factorization.

21790411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21790411 is about 4668.0200299485. The cubic root of 21790411 is about 279.3112792697.

It can be divided in two parts, 21790 and 411, that added together give a square (22201 = 149²).

The spelling of 21790411 in words is "twenty-one million, seven hundred ninety thousand, four hundred eleven".