21242676 has 96 divisors (see below), whose sum is σ = 62406400. Its totient is φ = 5588352.

The previous prime is 21242659. The next prime is 21242681. The reversal of 21242676 is 67624212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53310 + ... + 53706.

Almost surely, 2^21242676 is an apocalyptic number.

21242676 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21242676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31203200).

21242676 is an abundant number, since it is smaller than the sum of its proper divisors (41163724).

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

21242676 is a wasteful number, since it uses less digits than its factorization.

21242676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 422 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 21242676 is about 4608.9777608489. The cubic root of 21242676 is about 276.9510876462.

Adding to 21242676 its reverse (67624212), we get a palindrome (88866888).

The spelling of 21242676 in words is "twenty-one million, two hundred forty-two thousand, six hundred seventy-six".