21211121222012 has 24 divisors (see below), whose sum is σ = 38549611516416. Its totient is φ = 10204308919728.

The previous prime is 21211121221951. The next prime is 21211121222023. The reversal of 21211121222012 is 21022212111212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920290508 + ... + 920313555.

It is an arithmetic number, because the mean of its divisors is an integer number (1606233813184).

Almost surely, 2^{21211121222012} is an apocalyptic number.

It is an amenable number.

21211121222012 is a deficient number, since it is larger than the sum of its proper divisors (17338490294404).

21211121222012 is a wasteful number, since it uses less digits than its factorization.

21211121222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840604177 (or 1840604175 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21211121222012 its reverse (21022212111212), we get a palindrome (42233333333224).

The spelling of 21211121222012 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, twelve".