21882421 has 8 divisors (see below), whose sum is σ = 23946624. Its totient is φ = 19830720.

The previous prime is 21882403. The next prime is 21882439. The reversal of 21882421 is 12428812.

It is an interprime number because it is at equal distance from previous prime (21882403) and next prime (21882439).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21882421 - 2¹¹ = 21880373 is a prime.

It is a pancake number, because a pancake can be divided into 21882421 parts by 6615 straight cuts.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21882421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21882461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (2993328).

Almost surely, 2^21882421 is an apocalyptic number.

It is an amenable number.

21882421 is a deficient number, since it is larger than the sum of its proper divisors (2064203).

21882421 is a wasteful number, since it uses less digits than its factorization.

21882421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6251.

The product of its digits is 2048, while the sum is 28.

The square root of 21882421 is about 4677.8650044652. The cubic root of 21882421 is about 279.7038578138.

The spelling of 21882421 in words is "twenty-one million, eight hundred eighty-two thousand, four hundred twenty-one".