213121111431 has 8 divisors (see below), whose sum is σ = 290769888640. Its totient is φ = 138776537592.

The previous prime is 213121111297. The next prime is 213121111459. The reversal of 213121111431 is 134111121312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213121111431 - 2¹⁹ = 213120587143 is a prime.

It is a super-2 number, since 2×213121111431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213121111398 and 213121111407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121111481) 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 7 ways as a sum of consecutive naturals, for example, 826050691 + ... + 826050948.

It is an arithmetic number, because the mean of its divisors is an integer number (36346236080).

Almost surely, 2^213121111431 is an apocalyptic number.

213121111431 is a deficient number, since it is larger than the sum of its proper divisors (77648777209).

213121111431 is a wasteful number, since it uses less digits than its factorization.

213121111431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652101685.

The product of its digits is 144, while the sum is 21.

Adding to 213121111431 its reverse (134111121312), we get a palindrome (347232232743).

The spelling of 213121111431 in words is "two hundred thirteen billion, one hundred twenty-one million, one hundred eleven thousand, four hundred thirty-one".