21120021102212 has 12 divisors (see below), whose sum is σ = 37086180401676. Its totient is φ = 10523969558880.

The previous prime is 21120021102197. The next prime is 21120021102239. The reversal of 21120021102212 is 21220112002112.

It can be written as a sum of positive squares in 2 ways, for example, as 12657414291076 + 8462606811136 = 3557726^2 + 2909056^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9010246739 + ... + 9010249082.

It is an arithmetic number, because the mean of its divisors is an integer number (3090515033473).

Almost surely, 2^{21120021102212} is an apocalyptic number.

It is an amenable number.

21120021102212 is a deficient number, since it is larger than the sum of its proper divisors (15966159299464).

21120021102212 is a wasteful number, since it uses less digits than its factorization.

21120021102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18020496118 (or 18020496116 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120021102212 its reverse (21220112002112), we get a palindrome (42340133104324).

The spelling of 21120021102212 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, one hundred two thousand, two hundred twelve".