2100021210020 has 24 divisors (see below), whose sum is σ = 4410935487168. Its totient is φ = 839838780000.

The previous prime is 2100021209971. The next prime is 2100021210061. The reversal of 2100021210020 is 200121200012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2100021209983 and 2100021210010.

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, 10505006 + ... + 10703045.

It is an arithmetic number, because the mean of its divisors is an integer number (183788978632).

Almost surely, 2^{2100021210020} is an apocalyptic number.

2100021210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100021210020 is an abundant number, since it is smaller than the sum of its proper divisors (2310914277148).

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

2100021210020 is a wasteful number, since it uses less digits than its factorization.

2100021210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21213011 (or 21213009 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2100021210020 its reverse (200121200012), we get a palindrome (2300142410032).

The spelling of 2100021210020 in words is "two trillion, one hundred billion, twenty-one million, two hundred ten thousand, twenty".