211213123 has 12 divisors (see below), whose sum is σ = 233155384. Its totient is φ = 191188800.

The previous prime is 211213103. The next prime is 211213147. The reversal of 211213123 is 321312112.

It is not a de Polignac number, because 211213123 - 2⁵ = 211213091 is a prime.

It is a super-2 number, since 2×211213123² = 89221966654826258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211213097 and 211213106.

It is not an unprimeable number, because it can be changed into a prime (211213103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25540 + ... + 32782.

Almost surely, 2^211213123 is an apocalyptic number.

211213123 is a deficient number, since it is larger than the sum of its proper divisors (21942261).

211213123 is a wasteful number, since it uses less digits than its factorization.

211213123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7506 (or 7495 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 211213123 is about 14533.1731910137. The cubic root of 211213123 is about 595.5345552665.

Adding to 211213123 its reverse (321312112), we get a palindrome (532525235).

The spelling of 211213123 in words is "two hundred eleven million, two hundred thirteen thousand, one hundred twenty-three".