21451426 has 8 divisors (see below), whose sum is σ = 32235984. Its totient is φ = 10706100.

The previous prime is 21451373. The next prime is 21451427. The reversal of 21451426 is 62415412.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21451426.

It is not an unprimeable number, because it can be changed into a prime (21451427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8400 + ... + 10651.

It is an arithmetic number, because the mean of its divisors is an integer number (4029498).

Almost surely, 2^21451426 is an apocalyptic number.

21451426 is a deficient number, since it is larger than the sum of its proper divisors (10784558).

21451426 is a wasteful number, since it uses less digits than its factorization.

21451426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19616.

The product of its digits is 1920, while the sum is 25.

The square root of 21451426 is about 4631.5684168541. The cubic root of 21451426 is about 277.8553238550.

Adding to 21451426 its reverse (62415412), we get a palindrome (83866838).

The spelling of 21451426 in words is "twenty-one million, four hundred fifty-one thousand, four hundred twenty-six".