21242034 has 48 divisors (see below), whose sum is σ = 51901920. Its totient is φ = 6435000.

The previous prime is 21241991. The next prime is 21242047. The reversal of 21242034 is 43024212.

21242034 is a `hidden beast` number, since 212 + 420 + 34 = 666.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21241998 and 21242016.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4909 + ... + 8159.

It is an arithmetic number, because the mean of its divisors is an integer number (1081290).

Almost surely, 2^21242034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21242034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25950960).

21242034 is an abundant number, since it is smaller than the sum of its proper divisors (30659886).

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

21242034 is a wasteful number, since it uses less digits than its factorization.

21242034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3284 (or 3267 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 21242034 is about 4608.9081136425. The cubic root of 21242034 is about 276.9482975961.

Adding to 21242034 its reverse (43024212), we get a palindrome (64266246).

The spelling of 21242034 in words is "twenty-one million, two hundred forty-two thousand, thirty-four".