213013123 has 4 divisors (see below), whose sum is σ = 224224360. Its totient is φ = 201801888.

The previous prime is 213013117. The next prime is 213013147. The reversal of 213013123 is 321310312.

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

It is a de Polignac number, because none of the positive numbers 2^k-213013123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213013097 and 213013106.

It is not an unprimeable number, because it can be changed into a prime (213013103) 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, 5605590 + ... + 5605627.

It is an arithmetic number, because the mean of its divisors is an integer number (56056090).

Almost surely, 2^213013123 is an apocalyptic number.

213013123 is a deficient number, since it is larger than the sum of its proper divisors (11211237).

213013123 is a wasteful number, since it uses less digits than its factorization.

213013123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11211236.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213013123 is about 14594.9690989738. The cubic root of 213013123 is about 597.2215264837.

Adding to 213013123 its reverse (321310312), we get a palindrome (534323435).

The spelling of 213013123 in words is "two hundred thirteen million, thirteen thousand, one hundred twenty-three".