21142012 has 12 divisors (see below), whose sum is σ = 37036440. Its totient is φ = 10560176.

The previous prime is 21141973. The next prime is 21142021. The reversal of 21142012 is 21024112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21141983 and 21142001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3039 + ... + 7177.

It is an arithmetic number, because the mean of its divisors is an integer number (3086370).

Almost surely, 2^21142012 is an apocalyptic number.

It is an amenable number.

21142012 is a deficient number, since it is larger than the sum of its proper divisors (15894428).

21142012 is a wasteful number, since it uses less digits than its factorization.

21142012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420 (or 5418 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21142012 is about 4598.0443669021. The cubic root of 21142012 is about 276.5129263098.

Adding to 21142012 its reverse (21024112), we get a palindrome (42166124).

The spelling of 21142012 in words is "twenty-one million, one hundred forty-two thousand, twelve".