21019822 has 8 divisors (see below), whose sum is σ = 31549896. Its totient is φ = 10503192.

The previous prime is 21019799. The next prime is 21019841. The reversal of 21019822 is 22891012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2833 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (3943737).

Almost surely, 2^21019822 is an apocalyptic number.

21019822 is a deficient number, since it is larger than the sum of its proper divisors (10530074).

21019822 is a wasteful number, since it uses less digits than its factorization.

21019822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21019822 is about 4584.7379423474. The cubic root of 21019822 is about 275.9791957293.

The spelling of 21019822 in words is "twenty-one million, nineteen thousand, eight hundred twenty-two".