213221215123 has 16 divisors (see below), whose sum is σ = 271595358720. Its totient is φ = 162957211776.

The previous prime is 213221215121. The next prime is 213221215127. The reversal of 213221215123 is 321512122312.

It is a cyclic number.

It is not a de Polignac number, because 213221215123 - 2¹ = 213221215121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213221215121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47149711 + ... + 47154232.

It is an arithmetic number, because the mean of its divisors is an integer number (16974709920).

Almost surely, 2^213221215123 is an apocalyptic number.

213221215123 is a deficient number, since it is larger than the sum of its proper divisors (58374143597).

213221215123 is a wasteful number, since it uses less digits than its factorization.

213221215123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94303986.

The product of its digits is 1440, while the sum is 25.

Adding to 213221215123 its reverse (321512122312), we get a palindrome (534733337435).

The spelling of 213221215123 in words is "two hundred thirteen billion, two hundred twenty-one million, two hundred fifteen thousand, one hundred twenty-three".