213221230123 has 4 divisors (see below), whose sum is σ = 232604978328. Its totient is φ = 193837481920.

The previous prime is 213221230121. The next prime is 213221230147. The reversal of 213221230123 is 321032122312.

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 213221230123 - 2¹ = 213221230121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213221230094 and 213221230103.

It is not an unprimeable number, because it can be changed into a prime (213221230121) 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, 9691874086 + ... + 9691874107.

It is an arithmetic number, because the mean of its divisors is an integer number (58151244582).

Almost surely, 2^213221230123 is an apocalyptic number.

213221230123 is a deficient number, since it is larger than the sum of its proper divisors (19383748205).

213221230123 is a wasteful number, since it uses less digits than its factorization.

213221230123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19383748204.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 213221230123 its reverse (321032122312), we get a palindrome (534253352435).

It can be divided in two parts, 213221 and 230123, that added together give a palindrome (443344).

The spelling of 213221230123 in words is "two hundred thirteen billion, two hundred twenty-one million, two hundred thirty thousand, one hundred twenty-three".