211421279 has 4 divisors (see below), whose sum is σ = 211827600. Its totient is φ = 211014960.

The previous prime is 211421257. The next prime is 211421317. The reversal of 211421279 is 972124112.

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 211421279 - 2¹² = 211417183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202379 + ... + 203420.

It is an arithmetic number, because the mean of its divisors is an integer number (52956900).

Almost surely, 2^211421279 is an apocalyptic number.

211421279 is a deficient number, since it is larger than the sum of its proper divisors (406321).

211421279 is an equidigital number, since it uses as much as digits as its factorization.

211421279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406320.

The product of its digits is 2016, while the sum is 29.

The square root of 211421279 is about 14540.3328366307. The cubic root of 211421279 is about 595.7301292727.

The spelling of 211421279 in words is "two hundred eleven million, four hundred twenty-one thousand, two hundred seventy-nine".