21120222222212 has 6 divisors (see below), whose sum is σ = 36960388888878. Its totient is φ = 10560111111104.

The previous prime is 21120222222181. The next prime is 21120222222277. The reversal of 21120222222212 is 21222222202112.

It can be written as a sum of positive squares in only one way, i.e., 20264996775556 + 855225446656 = 4501666^2 + 924784^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640027777773 + ... + 2640027777780.

It is an arithmetic number, because the mean of its divisors is an integer number (6160064814813).

Almost surely, 2^{21120222222212} is an apocalyptic number.

It is an amenable number.

21120222222212 is a deficient number, since it is larger than the sum of its proper divisors (15840166666666).

21120222222212 is a wasteful number, since it uses less digits than its factorization.

21120222222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280055555557 (or 5280055555555 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21120222222212 its reverse (21222222202112), we get a palindrome (42342444424324).

The spelling of 21120222222212 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twelve".