1021002221100 has 288 divisors, whose sum is σ = 3055466937600. Its totient is φ = 263077032960.

The previous prime is 1021002221059. The next prime is 1021002221119. The reversal of 1021002221100 is 11222001201.

It is a super-2 number, since 2×1021002221100² (a number of 25 digits) contains 22 as substring.

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 95 ways as a sum of consecutive naturals, for example, 543953362 + ... + 543955238.

It is an arithmetic number, because the mean of its divisors is an integer number (10609260200).

Almost surely, 2^{1021002221100} is an apocalyptic number.

1021002221100 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 1021002221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1527733468800).

1021002221100 is an abundant number, since it is smaller than the sum of its proper divisors (2034464716500).

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

1021002221100 is a wasteful number, since it uses less digits than its factorization.

1021002221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369 (or 2362 counting only the distinct ones).

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

Adding to 1021002221100 its reverse (11222001201), we get a palindrome (1032224222301).

The spelling of 1021002221100 in words is "one trillion, twenty-one billion, two million, two hundred twenty-one thousand, one hundred".