21140012 has 12 divisors (see below), whose sum is σ = 37039296. Its totient is φ = 10557360.

The previous prime is 21140011. The next prime is 21140033. The reversal of 21140012 is 21004112.

It is a junction number, because it is equal to n+sod(n) for n = 21139975 and 21140002.

It is not an unprimeable number, because it can be changed into a prime (21140011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1298 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (3086608).

Almost surely, 2^21140012 is an apocalyptic number.

It is an amenable number.

21140012 is a deficient number, since it is larger than the sum of its proper divisors (15899284).

21140012 is a wasteful number, since it uses less digits than its factorization.

21140012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6328 (or 6326 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21140012 is about 4597.8268779936. The cubic root of 21140012 is about 276.5042068102.

Adding to 21140012 its reverse (21004112), we get a palindrome (42144124).

The spelling of 21140012 in words is "twenty-one million, one hundred forty thousand, twelve".