2100021212423 has 4 divisors (see below), whose sum is σ = 2100051516720. Its totient is φ = 2099990908128.

The previous prime is 2100021212417. The next prime is 2100021212473. The reversal of 2100021212423 is 3242121200012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2100021212423 - 2¹⁶ = 2100021146887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100021212395 and 2100021212404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100021212413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15047963 + ... + 15186876.

It is an arithmetic number, because the mean of its divisors is an integer number (525012879180).

Almost surely, 2^{2100021212423} is an apocalyptic number.

2100021212423 is a deficient number, since it is larger than the sum of its proper divisors (30304297).

2100021212423 is an equidigital number, since it uses as much as digits as its factorization.

2100021212423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30304296.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 2100021212423 its reverse (3242121200012), we get a palindrome (5342142412435).

The spelling of 2100021212423 in words is "two trillion, one hundred billion, twenty-one million, two hundred twelve thousand, four hundred twenty-three".