21770794 has 8 divisors (see below), whose sum is σ = 32677380. Its totient is φ = 10878336.

The previous prime is 21770747. The next prime is 21770797. The reversal of 21770794 is 49707712.

It can be written as a sum of positive squares in 2 ways, for example, as 21743569 + 27225 = 4663^2 + 165^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21770797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152 + ... + 6940.

Almost surely, 2^21770794 is an apocalyptic number.

21770794 is a deficient number, since it is larger than the sum of its proper divisors (10906586).

21770794 is a wasteful number, since it uses less digits than its factorization.

21770794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7064.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 21770794 is about 4665.9183447634. The cubic root of 21770794 is about 279.2274366652.

The spelling of 21770794 in words is "twenty-one million, seven hundred seventy thousand, seven hundred ninety-four".