21422012 has 6 divisors (see below), whose sum is σ = 37488528. Its totient is φ = 10711004.

The previous prime is 21421997. The next prime is 21422021. The reversal of 21422012 is 21022412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2677748 + ... + 2677755.

It is an arithmetic number, because the mean of its divisors is an integer number (6248088).

Almost surely, 2^21422012 is an apocalyptic number.

It is an amenable number.

21422012 is a deficient number, since it is larger than the sum of its proper divisors (16066516).

21422012 is a wasteful number, since it uses less digits than its factorization.

21422012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355507 (or 5355505 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21422012 is about 4628.3919453737. The cubic root of 21422012 is about 277.7282682014.

Adding to 21422012 its reverse (21022412), we get a palindrome (42444424).

The spelling of 21422012 in words is "twenty-one million, four hundred twenty-two thousand, twelve".