1021020110020 has 12 divisors (see below), whose sum is σ = 2144142231084. Its totient is φ = 408408044000.

The previous prime is 1021020110009. The next prime is 1021020110039. The reversal of 1021020110020 is 200110201201.

It can be written as a sum of positive squares in 2 ways, for example, as 305019825796 + 716000284224 = 552286^2 + 846168^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1021020109979 and 1021020110006.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25525502731 + ... + 25525502770.

It is an arithmetic number, because the mean of its divisors is an integer number (178678519257).

Almost surely, 2^{1021020110020} is an apocalyptic number.

1021020110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021020110020 is an abundant number, since it is smaller than the sum of its proper divisors (1123122121064).

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

1021020110020 is a wasteful number, since it uses less digits than its factorization.

1021020110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51051005510 (or 51051005508 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021020110020 its reverse (200110201201), we get a palindrome (1221130311221).

The spelling of 1021020110020 in words is "one trillion, twenty-one billion, twenty million, one hundred ten thousand, twenty".