21221112020212 has 48 divisors (see below), whose sum is σ = 42062690299392. Its totient is φ = 9299574311040.

The previous prime is 21221112020197. The next prime is 21221112020221. The reversal of 21221112020212 is 21202021112212.

It is a self number, because there is not a number n which added to its sum of digits gives 21221112020212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124107598 + ... + 124278469.

It is an arithmetic number, because the mean of its divisors is an integer number (876306047904).

Almost surely, 2^{21221112020212} is an apocalyptic number.

It is an amenable number.

21221112020212 is a deficient number, since it is larger than the sum of its proper divisors (20841578279180).

21221112020212 is a wasteful number, since it uses less digits than its factorization.

21221112020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248386168 (or 248386166 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221112020212 its reverse (21202021112212), we get a palindrome (42423133132424).

The spelling of 21221112020212 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, twenty thousand, two hundred twelve".