21994026 has 32 divisors (see below), whose sum is σ = 46891008. Its totient is φ = 6861360.

The previous prime is 21994013. The next prime is 21994031. The reversal of 21994026 is 62049912.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4791 + ... + 8181.

It is an arithmetic number, because the mean of its divisors is an integer number (1465344).

Almost surely, 2^21994026 is an apocalyptic number.

21994026 is an abundant number, since it is smaller than the sum of its proper divisors (24896982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21994026 is a wasteful number, since it uses less digits than its factorization.

21994026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21994026 is about 4689.7788860457. The cubic root of 21994026 is about 280.1785680680.

The spelling of 21994026 in words is "twenty-one million, nine hundred ninety-four thousand, twenty-six".