2120211220123 has 4 divisors (see below), whose sum is σ = 2231801284360. Its totient is φ = 2008621155888.

The previous prime is 2120211220109. The next prime is 2120211220129. The reversal of 2120211220123 is 3210221120212.

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 2120211220123 - 2¹³ = 2120211211931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 111590064217 = 2120211220123 / (2 + 1 + 2 + 0 + 2 + 1 + 1 + 2 + 2 + 0 + 1 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120211220123.

It is not an unprimeable number, because it can be changed into a prime (2120211220129) 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, 55795032090 + ... + 55795032127.

It is an arithmetic number, because the mean of its divisors is an integer number (557950321090).

Almost surely, 2^{2120211220123} is an apocalyptic number.

2120211220123 is a deficient number, since it is larger than the sum of its proper divisors (111590064237).

2120211220123 is a wasteful number, since it uses less digits than its factorization.

2120211220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111590064236.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2120211220123 its reverse (3210221120212), we get a palindrome (5330432340335).

The spelling of 2120211220123 in words is "two trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-three".