2100000001020 has 96 divisors (see below), whose sum is σ = 6040676174400. Its totient is φ = 544775792640.

The previous prime is 2100000000997. The next prime is 2100000001049. The reversal of 2100000001020 is 201000000012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

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, 364467 + ... + 2081546.

It is an arithmetic number, because the mean of its divisors is an integer number (62923710150).

Almost surely, 2^{2100000001020} is an apocalyptic number.

2100000001020 is a gapful number since it is divisible by the number (20) 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 2100000001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3020338087200).

2100000001020 is an abundant number, since it is smaller than the sum of its proper divisors (3940676173380).

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

2100000001020 is a wasteful number, since it uses less digits than its factorization.

2100000001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446415 (or 2446413 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 2100000001020 its reverse (201000000012), we get a palindrome (2301000001032).

The spelling of 2100000001020 in words is "two trillion, one hundred billion, one thousand, twenty".