211404323421 has 48 divisors (see below), whose sum is σ = 309806578224. Its totient is φ = 138904077312.

The previous prime is 211404323419. The next prime is 211404323423. The reversal of 211404323421 is 124323404112.

211404323421 is a `hidden beast` number, since 2 + 1 + 1 + 404 + 3 + 234 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (211404323419) and next prime (211404323423).

It can be written as a sum of positive squares in 8 ways, for example, as 50438871396 + 160965452025 = 224586^2 + 401205^2 .

It is not a de Polignac number, because 211404323421 - 2¹ = 211404323419 is a prime.

It is a super-2 number, since 2×211404323421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211404323423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110508361 + ... + 110510273.

It is an arithmetic number, because the mean of its divisors is an integer number (6454303713).

Almost surely, 2^211404323421 is an apocalyptic number.

It is an amenable number.

211404323421 is a deficient number, since it is larger than the sum of its proper divisors (98402254803).

211404323421 is a wasteful number, since it uses less digits than its factorization.

211404323421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670 (or 2667 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 211404323421 its reverse (124323404112), we get a palindrome (335727727533).

The spelling of 211404323421 in words is "two hundred eleven billion, four hundred four million, three hundred twenty-three thousand, four hundred twenty-one".