21419806 has 16 divisors (see below), whose sum is σ = 33699600. Its totient is φ = 10196928.

The previous prime is 21419789. The next prime is 21419807. The reversal of 21419806 is 60891412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21419807) 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, 1705 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (2106225).

Almost surely, 2^21419806 is an apocalyptic number.

21419806 is a deficient number, since it is larger than the sum of its proper divisors (12279794).

21419806 is a wasteful number, since it uses less digits than its factorization.

21419806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21419806 is about 4628.1536275279. The cubic root of 21419806 is about 277.7187345561.

The spelling of 21419806 in words is "twenty-one million, four hundred nineteen thousand, eight hundred six".