21146204 has 6 divisors (see below), whose sum is σ = 37005864. Its totient is φ = 10573100.

The previous prime is 21146197. The next prime is 21146207. The reversal of 21146204 is 40264112.

21146204 is nontrivially palindromic in base 14.

It is a super-3 number, since 3×21146204³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2643272 + ... + 2643279.

It is an arithmetic number, because the mean of its divisors is an integer number (6167644).

Almost surely, 2^21146204 is an apocalyptic number.

It is an amenable number.

21146204 is a deficient number, since it is larger than the sum of its proper divisors (15859660).

21146204 is a wasteful number, since it uses less digits than its factorization.

21146204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286555 (or 5286553 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21146204 is about 4598.5001902794. The cubic root of 21146204 is about 276.5312005968.

The spelling of 21146204 in words is "twenty-one million, one hundred forty-six thousand, two hundred four".