21012442012 has 12 divisors (see below), whose sum is σ = 36772861216. Its totient is φ = 10505910240.

The previous prime is 21012442001. The next prime is 21012442021. The reversal of 21012442012 is 21024421012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146008 + ... + 251680.

Almost surely, 2^21012442012 is an apocalyptic number.

It is an amenable number.

21012442012 is a deficient number, since it is larger than the sum of its proper divisors (15760419204).

21012442012 is a wasteful number, since it uses less digits than its factorization.

21012442012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155388 (or 155386 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21012442012 its reverse (21024421012), we get a palindrome (42036863024).

The spelling of 21012442012 in words is "twenty-one billion, twelve million, four hundred forty-two thousand, twelve".