21001221221102 has 16 divisors (see below), whose sum is σ = 32920271569152. Its totient is φ = 10038188864760.

The previous prime is 21001221221041. The next prime is 21001221221147. The reversal of 21001221221102 is 20112212210012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2597870924 + ... + 2597879007.

It is an arithmetic number, because the mean of its divisors is an integer number (2057516973072).

Almost surely, 2^{21001221221102} is an apocalyptic number.

21001221221102 is a deficient number, since it is larger than the sum of its proper divisors (11919050348050).

21001221221102 is a wasteful number, since it uses less digits than its factorization.

21001221221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195750023.

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

Adding to 21001221221102 its reverse (20112212210012), we get a palindrome (41113433431114).

The spelling of 21001221221102 in words is "twenty-one trillion, one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred two".