2101211100020 has 24 divisors (see below), whose sum is σ = 4520166319368. Its totient is φ = 819984819200.

The previous prime is 2101211099983. The next prime is 2101211100083. The reversal of 2101211100020 is 200011121012.

It can be written as a sum of positive squares in 4 ways, for example, as 398561296 + 2100812538724 = 19964^2 + 1449418^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2101211099974 and 2101211100010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281225461 + ... + 1281227100.

It is an arithmetic number, because the mean of its divisors is an integer number (188340263307).

Almost surely, 2^{2101211100020} is an apocalyptic number.

2101211100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101211100020 is an abundant number, since it is smaller than the sum of its proper divisors (2418955219348).

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

2101211100020 is a wasteful number, since it uses less digits than its factorization.

2101211100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562452611 (or 2562452609 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2101211100020 its reverse (200011121012), we get a palindrome (2301222221032).

The spelling of 2101211100020 in words is "two trillion, one hundred one billion, two hundred eleven million, one hundred thousand, twenty".