211020424 has 16 divisors (see below), whose sum is σ = 400110300. Its totient is φ = 104324352.

The previous prime is 211020413. The next prime is 211020427. The reversal of 211020424 is 424020112.

It can be written as a sum of positive squares in 2 ways, for example, as 203632900 + 7387524 = 14270^2 + 2718^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211020398 and 211020407.

It is not an unprimeable number, because it can be changed into a prime (211020427) 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, 147477 + ... + 148900.

Almost surely, 2^211020424 is an apocalyptic number.

It is an amenable number.

211020424 is a deficient number, since it is larger than the sum of its proper divisors (189089876).

211020424 is a wasteful number, since it uses less digits than its factorization.

211020424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296472 (or 296468 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 211020424 is about 14526.5420523950. The cubic root of 211020424 is about 595.3533893913.

Adding to 211020424 its reverse (424020112), we get a palindrome (635040536).

The spelling of 211020424 in words is "two hundred eleven million, twenty thousand, four hundred twenty-four".