1021100012220 has 24 divisors (see below), whose sum is σ = 2859080034384. Its totient is φ = 272293336576.

The previous prime is 1021100012209. The next prime is 1021100012237. The reversal of 1021100012220 is 222100011201.

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

It is a junction number, because it is equal to n+sod(n) for n = 1021100012196 and 1021100012205.

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, 8509166709 + ... + 8509166828.

It is an arithmetic number, because the mean of its divisors is an integer number (119128334766).

Almost surely, 2^{1021100012220} is an apocalyptic number.

1021100012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021100012220 is an abundant number, since it is smaller than the sum of its proper divisors (1837980022164).

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

1021100012220 is a wasteful number, since it uses less digits than its factorization.

1021100012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17018333549 (or 17018333547 counting only the distinct ones).

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

Adding to 1021100012220 its reverse (222100011201), we get a palindrome (1243200023421).

The spelling of 1021100012220 in words is "one trillion, twenty-one billion, one hundred million, twelve thousand, two hundred twenty".