21770194 has 8 divisors (see below), whose sum is σ = 32772348. Its totient is φ = 10846080.

The previous prime is 21770179. The next prime is 21770237. The reversal of 21770194 is 49107712.

It can be written as a sum of positive squares in 2 ways, for example, as 21298225 + 471969 = 4615^2 + 687^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 18807 + ... + 19930.

Almost surely, 2^21770194 is an apocalyptic number.

21770194 is a deficient number, since it is larger than the sum of its proper divisors (11002154).

21770194 is a wasteful number, since it uses less digits than its factorization.

21770194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39020.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 21770194 is about 4665.8540482960. The cubic root of 21770194 is about 279.2248714854.

The spelling of 21770194 in words is "twenty-one million, seven hundred seventy thousand, one hundred ninety-four".