2100000002120 has 32 divisors (see below), whose sum is σ = 4725385975800. Its totient is φ = 839931383808.

The previous prime is 2100000002117. The next prime is 2100000002161. The reversal of 2100000002120 is 212000000012.

It can be written as a sum of positive squares in 4 ways, for example, as 484218356164 + 1615781645956 = 695858^2 + 1271134^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 2100000002098 and 2100000002107.

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, 1647065 + ... + 2629224.

Almost surely, 2^{2100000002120} is an apocalyptic number.

2100000002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100000002120 is an abundant number, since it is smaller than the sum of its proper divisors (2625385973680).

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

2100000002120 is a wasteful number, since it uses less digits than its factorization.

2100000002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288577 (or 4288573 counting only the distinct ones).

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

Adding to 2100000002120 its reverse (212000000012), we get a palindrome (2312000002132).

The spelling of 2100000002120 in words is "two trillion, one hundred billion, two thousand, one hundred twenty".