2121231213 has 16 divisors (see below), whose sum is σ = 3209429760. Its totient is φ = 1384064928.

The previous prime is 2121231197. The next prime is 2121231223. The reversal of 2121231213 is 3121321212.

It is not a de Polignac number, because 2121231213 - 2⁴ = 2121231197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121231223) 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, 834520 + ... + 837057.

It is an arithmetic number, because the mean of its divisors is an integer number (200589360).

Almost surely, 2^2121231213 is an apocalyptic number.

It is an amenable number.

2121231213 is a deficient number, since it is larger than the sum of its proper divisors (1088198547).

2121231213 is a wasteful number, since it uses less digits than its factorization.

2121231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671633 (or 1671627 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2121231213 is about 46056.8259110417. The cubic root of 2121231213 is about 1284.8802975094.

Adding to 2121231213 its reverse (3121321212), we get a palindrome (5242552425).

It can be divided in two parts, 21212 and 31213, that added together give a palindrome (52425).

The spelling of 2121231213 in words is "two billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred thirteen".