102021221100 has 432 divisors, whose sum is σ = 330318795744. Its totient is φ = 24201216000.

The previous prime is 102021221051. The next prime is 102021221119. The reversal of 102021221100 is 1122120201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1010111050 + ... + 1010111150.

It is an arithmetic number, because the mean of its divisors is an integer number (764626842).

Almost surely, 2^102021221100 is an apocalyptic number.

102021221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102021221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165159397872).

102021221100 is an abundant number, since it is smaller than the sum of its proper divisors (228297574644).

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

102021221100 is a wasteful number, since it uses less digits than its factorization.

102021221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102021221100 its reverse (1122120201), we get a palindrome (103143341301).

The spelling of 102021221100 in words is "one hundred two billion, twenty-one million, two hundred twenty-one thousand, one hundred".