211340451 has 16 divisors (see below), whose sum is σ = 323009024. Its totient is φ = 120403584.

The previous prime is 211340443. The next prime is 211340453. The reversal of 211340451 is 154043112.

It is not a de Polignac number, because 211340451 - 2³ = 211340443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211340453) 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, 7855 + ... + 22008.

It is an arithmetic number, because the mean of its divisors is an integer number (20188064).

Almost surely, 2^211340451 is an apocalyptic number.

211340451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211340451 is a deficient number, since it is larger than the sum of its proper divisors (111668573).

211340451 is a wasteful number, since it uses less digits than its factorization.

211340451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30210.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 211340451 is about 14537.5531297395. The cubic root of 211340451 is about 595.6542021748.

Adding to 211340451 its reverse (154043112), we get a palindrome (365383563).

The spelling of 211340451 in words is "two hundred eleven million, three hundred forty thousand, four hundred fifty-one".