1021100101020 has 96 divisors (see below), whose sum is σ = 3343953580800. Its totient is φ = 257962128192.

The previous prime is 1021100101013. The next prime is 1021100101031. The reversal of 1021100101020 is 201010011201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1021100100993 and 1021100101011.

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, 49750954 + ... + 49771473.

It is an arithmetic number, because the mean of its divisors is an integer number (34832849800).

Almost surely, 2^{1021100101020} is an apocalyptic number.

1021100101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021100101020 is an abundant number, since it is smaller than the sum of its proper divisors (2322853479780).

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

1021100101020 is a wasteful number, since it uses less digits than its factorization.

1021100101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99522464 (or 99522456 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1021100101020 its reverse (201010011201), we get a palindrome (1222110112221).

The spelling of 1021100101020 in words is "one trillion, twenty-one billion, one hundred million, one hundred one thousand, twenty".