211420391 has 16 divisors (see below), whose sum is σ = 273907200. Its totient is φ = 158472288.

The previous prime is 211420373. The next prime is 211420399. The reversal of 211420391 is 193024112.

It is not a de Polignac number, because 211420391 - 2¹⁴ = 211404007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211420399) 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 15 ways as a sum of consecutive naturals, for example, 59411 + ... + 62868.

It is an arithmetic number, because the mean of its divisors is an integer number (17119200).

Almost surely, 2^211420391 is an apocalyptic number.

211420391 is a deficient number, since it is larger than the sum of its proper divisors (62486809).

211420391 is a wasteful number, since it uses less digits than its factorization.

211420391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122318.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 211420391 is about 14540.3023008464. The cubic root of 211420391 is about 595.7292952206.

The spelling of 211420391 in words is "two hundred eleven million, four hundred twenty thousand, three hundred ninety-one".