21084346 has 4 divisors (see below), whose sum is σ = 31626522. Its totient is φ = 10542172.

The previous prime is 21084317. The next prime is 21084377. The reversal of 21084346 is 64348012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17969121 + 3115225 = 4239^2 + 1765^2 .

It is a super-3 number, since 3×21084346³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5271085 + ... + 5271088.

Almost surely, 2^21084346 is an apocalyptic number.

21084346 is a deficient number, since it is larger than the sum of its proper divisors (10542176).

21084346 is a wasteful number, since it uses less digits than its factorization.

21084346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10542175.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21084346 is about 4591.7693757418. The cubic root of 21084346 is about 276.2612959898.

The spelling of 21084346 in words is "twenty-one million, eighty-four thousand, three hundred forty-six".