1021001001020 has 96 divisors (see below), whose sum is σ = 2878794487296. Its totient is φ = 293754528000.

The previous prime is 1021001001017. The next prime is 1021001001023. The reversal of 1021001001020 is 201001001201.

It is an interprime number because it is at equal distance from previous prime (1021001001017) and next prime (1021001001023).

It is a junction number, because it is equal to n+sod(n) for n = 1021001000989 and 1021001001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021001001023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25479506 + ... + 25519545.

It is an arithmetic number, because the mean of its divisors is an integer number (29987442576).

Almost surely, 2^{1021001001020} is an apocalyptic number.

1021001001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021001001020 is an abundant number, since it is smaller than the sum of its proper divisors (1857793486276).

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

1021001001020 is a wasteful number, since it uses less digits than its factorization.

1021001001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50999091 (or 50999089 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1021001001020 its reverse (201001001201), we get a palindrome (1222002002221).

The spelling of 1021001001020 in words is "one trillion, twenty-one billion, one million, one thousand, twenty".