21102221221012 has 24 divisors (see below), whose sum is σ = 37138956896160. Its totient is φ = 10491102626400.

The previous prime is 21102221221009. The next prime is 21102221221013. The reversal of 21102221221012 is 21012212220112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102221221013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5600763 + ... + 8577469.

It is an arithmetic number, because the mean of its divisors is an integer number (1547456537340).

Almost surely, 2^{21102221221012} is an apocalyptic number.

It is an amenable number.

21102221221012 is a deficient number, since it is larger than the sum of its proper divisors (16036735675148).

21102221221012 is a wasteful number, since it uses less digits than its factorization.

21102221221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986791 (or 2986789 counting only the distinct ones).

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

Adding to 21102221221012 its reverse (21012212220112), we get a palindrome (42114433441124).

The spelling of 21102221221012 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-one million, two hundred twenty-one thousand, twelve".