2100021212120 has 64 divisors (see below), whose sum is σ = 5088702104640. Its totient is φ = 775363622400.

The previous prime is 2100021212089. The next prime is 2100021212147. The reversal of 2100021212120 is 212121200012.

It is a junction number, because it is equal to n+sod(n) for n = 2100021212095 and 2100021212104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18200210 + ... + 18315230.

It is an arithmetic number, because the mean of its divisors is an integer number (79510970385).

Almost surely, 2^{2100021212120} is an apocalyptic number.

2100021212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100021212120 is an abundant number, since it is smaller than the sum of its proper divisors (2988680892520).

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

2100021212120 is a wasteful number, since it uses less digits than its factorization.

2100021212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150156 (or 150152 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2100021212120 its reverse (212121200012), we get a palindrome (2312142412132).

The spelling of 2100021212120 in words is "two trillion, one hundred billion, twenty-one million, two hundred twelve thousand, one hundred twenty".