21022121111012 has 24 divisors (see below), whose sum is σ = 42056404475904. Its totient is φ = 9006874278912.

The previous prime is 21022121111011. The next prime is 21022121111053. The reversal of 21022121111012 is 21011112122012.

It is not an unprimeable number, because it can be changed into a prime (21022121111011) by changing a digit.

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, 108493028 + ... + 108686619.

It is an arithmetic number, because the mean of its divisors is an integer number (1752350186496).

Almost surely, 2^{21022121111012} is an apocalyptic number.

It is an amenable number.

21022121111012 is an abundant number, since it is smaller than the sum of its proper divisors (21034283364892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21022121111012 is a wasteful number, since it uses less digits than its factorization.

21022121111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217183115 (or 217183113 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21022121111012 its reverse (21011112122012), we get a palindrome (42033233233024).

The spelling of 21022121111012 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, twelve".