211420520 has 16 divisors (see below), whose sum is σ = 475696260. Its totient is φ = 84568192.

The previous prime is 211420513. The next prime is 211420567. The reversal of 211420520 is 25024112.

It can be written as a sum of positive squares in 2 ways, for example, as 171452836 + 39967684 = 13094^2 + 6322^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2642717 + ... + 2642796.

Almost surely, 2^211420520 is an apocalyptic number.

211420520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211420520 is an abundant number, since it is smaller than the sum of its proper divisors (264275740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211420520 is a wasteful number, since it uses less digits than its factorization.

211420520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5285524 (or 5285520 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 211420520 is about 14540.3067367920. The cubic root of 211420520 is about 595.7294163837.

Adding to 211420520 its reverse (25024112), we get a palindrome (236444632).

The spelling of 211420520 in words is "two hundred eleven million, four hundred twenty thousand, five hundred twenty".