2121430211 has 4 divisors (see below), whose sum is σ = 2166567072. Its totient is φ = 2076293352.

The previous prime is 2121430193. The next prime is 2121430217. The reversal of 2121430211 is 1120341212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121430211 is a prime.

It is a super-2 number, since 2×2121430211² = 9000932280287009042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121430211.

It is not an unprimeable number, because it can be changed into a prime (2121430217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22568360 + ... + 22568453.

It is an arithmetic number, because the mean of its divisors is an integer number (541641768).

Almost surely, 2^2121430211 is an apocalyptic number.

2121430211 is a deficient number, since it is larger than the sum of its proper divisors (45136861).

2121430211 is an equidigital number, since it uses as much as digits as its factorization.

2121430211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45136860.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2121430211 is about 46058.9862133330. The cubic root of 2121430211 is about 1284.9204755300.

Adding to 2121430211 its reverse (1120341212), we get a palindrome (3241771423).

The spelling of 2121430211 in words is "two billion, one hundred twenty-one million, four hundred thirty thousand, two hundred eleven".