213121142403 has 16 divisors (see below), whose sum is σ = 306105144576. Its totient is φ = 131115025440.

The previous prime is 213121142393. The next prime is 213121142407. The reversal of 213121142403 is 304241121312.

It is not a de Polignac number, because 213121142403 - 2⁵ = 213121142371 is a prime.

It is a super-2 number, since 2×213121142403² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213121142407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616833 + ... + 898178.

It is an arithmetic number, because the mean of its divisors is an integer number (19131571536).

Almost surely, 2^213121142403 is an apocalyptic number.

213121142403 is a deficient number, since it is larger than the sum of its proper divisors (92984002173).

213121142403 is a wasteful number, since it uses less digits than its factorization.

213121142403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518634.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 213121142403 its reverse (304241121312), we get a palindrome (517362263715).

The spelling of 213121142403 in words is "two hundred thirteen billion, one hundred twenty-one million, one hundred forty-two thousand, four hundred three".