21221011122102 has 96 divisors (see below), whose sum is σ = 50534679686400. Its totient is φ = 6382540512960.

The previous prime is 21221011122019. The next prime is 21221011122251. The reversal of 21221011122102 is 20122111012212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19579399 + ... + 20634797.

It is an arithmetic number, because the mean of its divisors is an integer number (526402913400).

Almost surely, 2^{21221011122102} is an apocalyptic number.

21221011122102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221011122102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25267339843200).

21221011122102 is an abundant number, since it is smaller than the sum of its proper divisors (29313668564298).

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

21221011122102 is a wasteful number, since it uses less digits than its factorization.

21221011122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056178 (or 1056175 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21221011122102 its reverse (20122111012212), we get a palindrome (41343122134314).

The spelling of 21221011122102 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-two thousand, one hundred two".