21426794 has 24 divisors (see below), whose sum is σ = 34564320. Its totient is φ = 9957672.

The previous prime is 21426793. The next prime is 21426803. The reversal of 21426794 is 49762412.

It is a super-2 number, since 2×21426794² = 918215002236872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21426793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42347 + ... + 42849.

It is an arithmetic number, because the mean of its divisors is an integer number (1440180).

Almost surely, 2^21426794 is an apocalyptic number.

21426794 is a deficient number, since it is larger than the sum of its proper divisors (13137526).

21426794 is a wasteful number, since it uses less digits than its factorization.

21426794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602 (or 583 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 21426794 is about 4628.9085106535. The cubic root of 21426794 is about 277.7489322699.

The spelling of 21426794 in words is "twenty-one million, four hundred twenty-six thousand, seven hundred ninety-four".