21875012 has 6 divisors (see below), whose sum is σ = 38281278. Its totient is φ = 10937504.

The previous prime is 21874999. The next prime is 21875033. The reversal of 21875012 is 21057812.

It can be written as a sum of positive squares in only one way, i.e., 21659716 + 215296 = 4654^2 + 464^2 .

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, 2734373 + ... + 2734380.

It is an arithmetic number, because the mean of its divisors is an integer number (6380213).

Almost surely, 2^21875012 is an apocalyptic number.

It is an amenable number.

21875012 is a deficient number, since it is larger than the sum of its proper divisors (16406266).

21875012 is a wasteful number, since it uses less digits than its factorization.

21875012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468757 (or 5468755 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 21875012 is about 4677.0730163212. The cubic root of 21875012 is about 279.6722866604.

The spelling of 21875012 in words is "twenty-one million, eight hundred seventy-five thousand, twelve".