211411421 has 24 divisors (see below), whose sum is σ = 240416904. Its totient is φ = 184746240.

The previous prime is 211411411. The next prime is 211411427. The reversal of 211411421 is 124114112.

It can be written as a sum of positive squares in 12 ways, for example, as 174372025 + 37039396 = 13205^2 + 6086^2 .

It is not a de Polignac number, because 211411421 - 2²² = 207217117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211411421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211411427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 666755 + ... + 667071.

It is an arithmetic number, because the mean of its divisors is an integer number (10017371).

Almost surely, 2^211411421 is an apocalyptic number.

It is an amenable number.

211411421 is a deficient number, since it is larger than the sum of its proper divisors (29005483).

211411421 is a wasteful number, since it uses less digits than its factorization.

211411421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 420 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

The square root of 211411421 is about 14539.9938445654. The cubic root of 211411421 is about 595.7208700362.

Adding to 211411421 its reverse (124114112), we get a palindrome (335525533).

It can be divided in two parts, 21141 and 1421, that multiplied together give a square (30041361 = 5481²).

The spelling of 211411421 in words is "two hundred eleven million, four hundred eleven thousand, four hundred twenty-one".