21223120012 has 12 divisors (see below), whose sum is σ = 37487567880. Its totient is φ = 10512386336.

The previous prime is 21223119979. The next prime is 21223120049. The reversal of 21223120012 is 21002132212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24792937 + ... + 24793792.

It is an arithmetic number, because the mean of its divisors is an integer number (3123963990).

Almost surely, 2^21223120012 is an apocalyptic number.

It is an amenable number.

21223120012 is a deficient number, since it is larger than the sum of its proper divisors (16264447868).

21223120012 is a wasteful number, since it uses less digits than its factorization.

21223120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49586840 (or 49586838 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21223120012 its reverse (21002132212), we get a palindrome (42225252224).

The spelling of 21223120012 in words is "twenty-one billion, two hundred twenty-three million, one hundred twenty thousand, twelve".