21273004 has 6 divisors (see below), whose sum is σ = 37227764. Its totient is φ = 10636500.

The previous prime is 21272987. The next prime is 21273011. The reversal of 21273004 is 40037212.

It is a plaindrome in base 16.

It is an unprimeable number.

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, 2659122 + ... + 2659129.

Almost surely, 2^21273004 is an apocalyptic number.

It is an amenable number.

21273004 is a deficient number, since it is larger than the sum of its proper divisors (15954760).

21273004 is a wasteful number, since it uses less digits than its factorization.

21273004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318255 (or 5318253 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21273004 is about 4612.2666878662. The cubic root of 21273004 is about 277.0828252627.

The spelling of 21273004 in words is "twenty-one million, two hundred seventy-three thousand, four".