211403421 has 12 divisors (see below), whose sum is σ = 312808860. Its totient is φ = 137497920.

The previous prime is 211403389. The next prime is 211403441. The reversal of 211403421 is 124304112.

211403421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 41100921 + 170302500 = 6411^2 + 13050^2 .

It is not a de Polignac number, because 211403421 - 2⁵ = 211403389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211403394 and 211403403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211403441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286086 + ... + 286823.

It is an arithmetic number, because the mean of its divisors is an integer number (26067405).

Almost surely, 2^211403421 is an apocalyptic number.

It is an amenable number.

211403421 is a deficient number, since it is larger than the sum of its proper divisors (101405439).

211403421 is a wasteful number, since it uses less digits than its factorization.

211403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572956 (or 572953 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 211403421 is about 14539.7187386827. The cubic root of 211403421 is about 595.7133557353.

Adding to 211403421 its reverse (124304112), we get a palindrome (335707533).

The spelling of 211403421 in words is "two hundred eleven million, four hundred three thousand, four hundred twenty-one".