2123513031 has 4 divisors (see below), whose sum is σ = 2831350712. Its totient is φ = 1415675352.

The previous prime is 2123513011. The next prime is 2123513057. The reversal of 2123513031 is 1303153212.

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

It is not a de Polignac number, because 2123513031 - 2⁶ = 2123512967 is a prime.

It is a super-2 number, since 2×2123513031² = 9018615185653613922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123512989 and 2123513007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123513011) 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, 353918836 + ... + 353918841.

It is an arithmetic number, because the mean of its divisors is an integer number (707837678).

Almost surely, 2^2123513031 is an apocalyptic number.

2123513031 is a deficient number, since it is larger than the sum of its proper divisors (707837681).

2123513031 is an equidigital number, since it uses as much as digits as its factorization.

2123513031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707837680.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 2123513031 is about 46081.5910207102. The cubic root of 2123513031 is about 1285.3408495900.

Adding to 2123513031 its reverse (1303153212), we get a palindrome (3426666243).

The spelling of 2123513031 in words is "two billion, one hundred twenty-three million, five hundred thirteen thousand, thirty-one".