2123634880891 has 4 divisors (see below), whose sum is σ = 2235405137800. Its totient is φ = 2011864623984.

The previous prime is 2123634880849. The next prime is 2123634880901. The reversal of 2123634880891 is 1980884363212.

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 2123634880891 - 2¹¹ = 2123634878843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123634880691) 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, 55885128426 + ... + 55885128463.

It is an arithmetic number, because the mean of its divisors is an integer number (558851284450).

Almost surely, 2^{2123634880891} is an apocalyptic number.

2123634880891 is a deficient number, since it is larger than the sum of its proper divisors (111770256909).

2123634880891 is a wasteful number, since it uses less digits than its factorization.

2123634880891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111770256908.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 2123634880891 in words is "two trillion, one hundred twenty-three billion, six hundred thirty-four million, eight hundred eighty thousand, eight hundred ninety-one".