21212794 has 8 divisors (see below), whose sum is σ = 32176980. Its totient is φ = 10487136.

The previous prime is 21212777. The next prime is 21212809. The reversal of 21212794 is 49721212.

It can be written as a sum of positive squares in 2 ways, for example, as 21040569 + 172225 = 4587^2 + 415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59409 + ... + 59764.

Almost surely, 2^21212794 is an apocalyptic number.

21212794 is a deficient number, since it is larger than the sum of its proper divisors (10964186).

21212794 is a wasteful number, since it uses less digits than its factorization.

21212794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119264.

The product of its digits is 2016, while the sum is 28.

The square root of 21212794 is about 4605.7349033569. The cubic root of 21212794 is about 276.8211646557.

The spelling of 21212794 in words is "twenty-one million, two hundred twelve thousand, seven hundred ninety-four".