21794930 has 16 divisors (see below), whose sum is σ = 39637080. Its totient is φ = 8627712.

The previous prime is 21794879. The next prime is 21794933. The reversal of 21794930 is 3949712.

It can be written as a sum of positive squares in 4 ways, for example, as 19193161 + 2601769 = 4381^2 + 1613^2 .

It is not an unprimeable number, because it can be changed into a prime (21794933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10265 + ... + 12204.

Almost surely, 2^21794930 is an apocalyptic number.

21794930 is a deficient number, since it is larger than the sum of its proper divisors (17842150).

21794930 is a wasteful number, since it uses less digits than its factorization.

21794930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22573.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 21794930 is about 4668.5040430528. The cubic root of 21794930 is about 279.3305862396.

It can be divided in two parts, 2 and 1794930, that multiplied together give a triangular number (3589860 = T₂₆₇₉).

The spelling of 21794930 in words is "twenty-one million, seven hundred ninety-four thousand, nine hundred thirty".