211421131 has 4 divisors (see below), whose sum is σ = 215004600. Its totient is φ = 207837664.

The previous prime is 211421123. The next prime is 211421137. The reversal of 211421131 is 131124112.

211421131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 211421131 - 2³ = 211421123 is a prime.

It is a super-2 number, since 2×211421131² = 89397789266638322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211421137) 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, 1791646 + ... + 1791763.

It is an arithmetic number, because the mean of its divisors is an integer number (53751150).

Almost surely, 2^211421131 is an apocalyptic number.

211421131 is a deficient number, since it is larger than the sum of its proper divisors (3583469).

211421131 is an equidigital number, since it uses as much as digits as its factorization.

211421131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583468.

The product of its digits is 48, while the sum is 16.

The square root of 211421131 is about 14540.3277473377. The cubic root of 211421131 is about 595.7299902642.

Adding to 211421131 its reverse (131124112), we get a palindrome (342545243).

The spelling of 211421131 in words is "two hundred eleven million, four hundred twenty-one thousand, one hundred thirty-one".