21443794 has 16 divisors (see below), whose sum is σ = 33238296. Its totient is φ = 10368000.

The previous prime is 21443777. The next prime is 21443801. The reversal of 21443794 is 49734412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21040569 + 403225 = 4587^2 + 635^2 .

It is a super-2 number, since 2×21443794² = 919672602228872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12594 + ... + 14194.

Almost surely, 2^21443794 is an apocalyptic number.

21443794 is a deficient number, since it is larger than the sum of its proper divisors (11794502).

21443794 is a wasteful number, since it uses less digits than its factorization.

21443794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821.

The product of its digits is 24192, while the sum is 34.

The square root of 21443794 is about 4630.7444325940. The cubic root of 21443794 is about 277.8223681069.

The spelling of 21443794 in words is "twenty-one million, four hundred forty-three thousand, seven hundred ninety-four".