21221101220102 has 64 divisors (see below), whose sum is σ = 37999665976320. Its totient is φ = 8695764502656.

The previous prime is 21221101220089. The next prime is 21221101220119. The reversal of 21221101220102 is 20102210112212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115594328 + ... + 115777764.

It is an arithmetic number, because the mean of its divisors is an integer number (593744780880).

Almost surely, 2^{21221101220102} is an apocalyptic number.

21221101220102 is a deficient number, since it is larger than the sum of its proper divisors (16778564756218).

21221101220102 is a wasteful number, since it uses less digits than its factorization.

21221101220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186245.

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

Adding to 21221101220102 its reverse (20102210112212), we get a palindrome (41323311332314).

The spelling of 21221101220102 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, one hundred two".