21222100111012 has 24 divisors (see below), whose sum is σ = 38006143360416. Its totient is φ = 10363251073728.

The previous prime is 21222100110997. The next prime is 21222100111033. The reversal of 21222100111012 is 21011100122212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4396633 + ... + 7859680.

It is an arithmetic number, because the mean of its divisors is an integer number (1583589306684).

Almost surely, 2^{21222100111012} is an apocalyptic number.

It is an amenable number.

21222100111012 is a deficient number, since it is larger than the sum of its proper divisors (16784043249404).

21222100111012 is a wasteful number, since it uses less digits than its factorization.

21222100111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12266427 (or 12266425 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21222100111012 its reverse (21011100122212), we get a palindrome (42233200233224).

The spelling of 21222100111012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred million, one hundred eleven thousand, twelve".