21221212102122 has 16 divisors (see below), whose sum is σ = 42442621846560. Its totient is φ = 7073704426992.

The previous prime is 21221212102121. The next prime is 21221212102133. The reversal of 21221212102122 is 22120121212212.

It is not an unprimeable number, because it can be changed into a prime (21221212102121) 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, 6820573 + ... + 9432000.

It is an arithmetic number, because the mean of its divisors is an integer number (2652663865410).

Almost surely, 2^{21221212102122} is an apocalyptic number.

21221212102122 is an abundant number, since it is smaller than the sum of its proper divisors (21221409744438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221212102122 is a wasteful number, since it uses less digits than its factorization.

21221212102122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16470197.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21221212102122 its reverse (22120121212212), we get a palindrome (43341333314334).

The spelling of 21221212102122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred two thousand, one hundred twenty-two".