2121003213 has 64 divisors (see below), whose sum is σ = 3454894080. Its totient is φ = 1131311808.

The previous prime is 2121003211. The next prime is 2121003217. The reversal of 2121003213 is 3123001212.

It is not a de Polignac number, because 2121003213 - 2¹ = 2121003211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121003192 and 2121003201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121003211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7494570 + ... + 7494852.

It is an arithmetic number, because the mean of its divisors is an integer number (53982720).

Almost surely, 2^2121003213 is an apocalyptic number.

2121003213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2121003213 is a deficient number, since it is larger than the sum of its proper divisors (1333890867).

2121003213 is a wasteful number, since it uses less digits than its factorization.

2121003213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2121003213 is about 46054.3506413889. The cubic root of 2121003213 is about 1284.8342608487.

Adding to 2121003213 its reverse (3123001212), we get a palindrome (5244004425).

The spelling of 2121003213 in words is "two billion, one hundred twenty-one million, three thousand, two hundred thirteen".