21967426 has 16 divisors (see below), whose sum is σ = 35804664. Its totient is φ = 10047744.

The previous prime is 21967409. The next prime is 21967433. The reversal of 21967426 is 62476912.

It can be written as a sum of positive squares in 4 ways, for example, as 14432401 + 7535025 = 3799^2 + 2745^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 801 + ... + 6676.

Almost surely, 2^21967426 is an apocalyptic number.

21967426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21967426 is a deficient number, since it is larger than the sum of its proper divisors (13837238).

21967426 is a wasteful number, since it uses less digits than its factorization.

21967426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7605.

The product of its digits is 36288, while the sum is 37.

The square root of 21967426 is about 4686.9420734633. The cubic root of 21967426 is about 280.0655713778.

The spelling of 21967426 in words is "twenty-one million, nine hundred sixty-seven thousand, four hundred twenty-six".