21995426 has 8 divisors (see below), whose sum is σ = 34729680. Its totient is φ = 10418868.

The previous prime is 21995423. The next prime is 21995431. The reversal of 21995426 is 62459912.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 578827 = 21995426 / (2 + 1 + 9 + 9 + 5 + 4 + 2 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 21995426.

It is not an unprimeable number, because it can be changed into a prime (21995423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289376 + ... + 289451.

It is an arithmetic number, because the mean of its divisors is an integer number (4341210).

Almost surely, 2^21995426 is an apocalyptic number.

21995426 is a deficient number, since it is larger than the sum of its proper divisors (12734254).

21995426 is a wasteful number, since it uses less digits than its factorization.

21995426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578848.

The product of its digits is 38880, while the sum is 38.

The square root of 21995426 is about 4689.9281444389. The cubic root of 21995426 is about 280.1845127379.

The spelling of 21995426 in words is "twenty-one million, nine hundred ninety-five thousand, four hundred twenty-six".