1021021021020 has 768 divisors, whose sum is σ = 4104914817024. Its totient is φ = 182476800000.

The previous prime is 1021021020991. The next prime is 1021021021021. The reversal of 1021021021020 is 201201201201.

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 = 1021021020987 and 1021021021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021021021) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 103118070 + ... + 103127970.

It is an arithmetic number, because the mean of its divisors is an integer number (5344941168).

Almost surely, 2^{1021021021020} is an apocalyptic number.

1021021021020 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 1021021021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2052457408512).

1021021021020 is an abundant number, since it is smaller than the sum of its proper divisors (3083893796004).

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

1021021021020 is a wasteful number, since it uses less digits than its factorization.

1021021021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10062 (or 10060 counting only the distinct ones).

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

Adding to 1021021021020 its reverse (201201201201), we get a palindrome (1222222222221).

The spelling of 1021021021020 in words is "one trillion, twenty-one billion, twenty-one million, twenty-one thousand, twenty".