21411234 has 48 divisors (see below), whose sum is σ = 51330552. Its totient is φ = 6407424.

The previous prime is 21411223. The next prime is 21411239. The reversal of 21411234 is 43211412.

21411234 is a `hidden beast` number, since 21 + 411 + 234 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20277009 + 1134225 = 4503^2 + 1065^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21411239) 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, 7422 + ... + 9894.

Almost surely, 2^21411234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21411234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25665276).

21411234 is an abundant number, since it is smaller than the sum of its proper divisors (29919318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21411234 is a wasteful number, since it uses less digits than its factorization.

21411234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 2528 counting only the distinct ones).

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

The square root of 21411234 is about 4627.2274636114. The cubic root of 21411234 is about 277.6816828258.

Adding to 21411234 its reverse (43211412), we get a palindrome (64622646).

It can be divided in two parts, 2141 and 1234, that added together give a cube (3375 = 15³).

The spelling of 21411234 in words is "twenty-one million, four hundred eleven thousand, two hundred thirty-four".