211024421 has 4 divisors (see below), whose sum is σ = 211954272. Its totient is φ = 210094572.

The previous prime is 211024403. The next prime is 211024427. The reversal of 211024421 is 124420112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211024421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211024421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211024427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464585 + ... + 465038.

It is an arithmetic number, because the mean of its divisors is an integer number (52988568).

Almost surely, 2^211024421 is an apocalyptic number.

It is an amenable number.

211024421 is a deficient number, since it is larger than the sum of its proper divisors (929851).

211024421 is an equidigital number, since it uses as much as digits as its factorization.

211024421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929850.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211024421 is about 14526.6796274992. The cubic root of 211024421 is about 595.3571482889.

Adding to 211024421 its reverse (124420112), we get a palindrome (335444533).

The spelling of 211024421 in words is "two hundred eleven million, twenty-four thousand, four hundred twenty-one".