2111520023 has 4 divisors (see below), whose sum is σ = 2114814768. Its totient is φ = 2108225280.

The previous prime is 2111520007. The next prime is 2111520079. The reversal of 2111520023 is 3200251112.

It is a happy number.

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 2111520023 - 2⁴ = 2111520007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111519983 and 2111520010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111520823) 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, 1646411 + ... + 1647692.

It is an arithmetic number, because the mean of its divisors is an integer number (528703692).

Almost surely, 2^2111520023 is an apocalyptic number.

2111520023 is a deficient number, since it is larger than the sum of its proper divisors (3294745).

2111520023 is an equidigital number, since it uses as much as digits as its factorization.

2111520023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294744.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2111520023 is about 45951.2787961336. The cubic root of 2111520023 is about 1282.9165312820.

Adding to 2111520023 its reverse (3200251112), we get a palindrome (5311771135).

The spelling of 2111520023 in words is "two billion, one hundred eleven million, five hundred twenty thousand, twenty-three".