13213123021 has 16 divisors (see below), whose sum is σ = 15620456320. Its totient is φ = 10940132160.

The previous prime is 13213123009. The next prime is 13213123067. The reversal of 13213123021 is 12032131231.

It is a cyclic number.

It is not a de Polignac number, because 13213123021 - 2²⁷ = 13078905293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13213123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13213123321) 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, 147510 + ... + 219511.

It is an arithmetic number, because the mean of its divisors is an integer number (976278520).

Almost surely, 2^13213123021 is an apocalyptic number.

It is an amenable number.

13213123021 is a deficient number, since it is larger than the sum of its proper divisors (2407333299).

13213123021 is a wasteful number, since it uses less digits than its factorization.

13213123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367204.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13213123021 its reverse (12032131231), we get a palindrome (25245254252).

The spelling of 13213123021 in words is "thirteen billion, two hundred thirteen million, one hundred twenty-three thousand, twenty-one".