1021001110020 has 72 divisors (see below), whose sum is σ = 3111714715200. Its totient is φ = 270976587840.

The previous prime is 1021001109971. The next prime is 1021001110037. The reversal of 1021001110020 is 200111001201.

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 = 1021001109984 and 1021001110011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13403320 + ... + 13479279.

Almost surely, 2^{1021001110020} is an apocalyptic number.

1021001110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021001110020 is an abundant number, since it is smaller than the sum of its proper divisors (2090713605180).

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

1021001110020 is a wasteful number, since it uses less digits than its factorization.

1021001110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26882825 (or 26882820 counting only the distinct ones).

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

Adding to 1021001110020 its reverse (200111001201), we get a palindrome (1221112111221).

The spelling of 1021001110020 in words is "one trillion, twenty-one billion, one million, one hundred ten thousand, twenty".