2100021210021 has 32 divisors (see below), whose sum is σ = 3388611034368. Its totient is φ = 1129309332480.

The previous prime is 2100021209971. The next prime is 2100021210061. The reversal of 2100021210021 is 1200121200012.

It is not a de Polignac number, because 2100021210021 - 2⁹ = 2100021209509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100021209979 and 2100021210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100021210061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3311791 + ... + 3894611.

It is an arithmetic number, because the mean of its divisors is an integer number (105894094824).

Almost surely, 2^{2100021210021} is an apocalyptic number.

2100021210021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2100021210021 is a deficient number, since it is larger than the sum of its proper divisors (1288589824347).

2100021210021 is a wasteful number, since it uses less digits than its factorization.

2100021210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592941.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2100021210021 its reverse (1200121200012), we get a palindrome (3300142410033).

The spelling of 2100021210021 in words is "two trillion, one hundred billion, twenty-one million, two hundred ten thousand, twenty-one".