21142612 has 24 divisors (see below), whose sum is σ = 39110400. Its totient is φ = 9980256.

The previous prime is 21142531. The next prime is 21142613. The reversal of 21142612 is 21624112.

It is a self number, because there is not a number n which added to its sum of digits gives 21142612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5814 + ... + 8722.

It is an arithmetic number, because the mean of its divisors is an integer number (1629600).

Almost surely, 2^21142612 is an apocalyptic number.

It is an amenable number.

21142612 is a deficient number, since it is larger than the sum of its proper divisors (17967788).

21142612 is a wasteful number, since it uses less digits than its factorization.

21142612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015 (or 3013 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 21142612 is about 4598.1096115686. The cubic root of 21142612 is about 276.5155420524.

Adding to 21142612 its reverse (21624112), we get a palindrome (42766724).

The spelling of 21142612 in words is "twenty-one million, one hundred forty-two thousand, six hundred twelve".