21421883 has 8 divisors (see below), whose sum is σ = 24541440. Its totient is φ = 18317160.

The previous prime is 21421861. The next prime is 21421903. The reversal of 21421883 is 38812412.

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 21421883 - 2⁸ = 21421627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21421823) 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, 413 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (3067680).

Almost surely, 2^21421883 is an apocalyptic number.

21421883 is a deficient number, since it is larger than the sum of its proper divisors (3119557).

21421883 is an equidigital number, since it uses as much as digits as its factorization.

21421883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7417.

The product of its digits is 3072, while the sum is 29.

The square root of 21421883 is about 4628.3780096271. The cubic root of 21421883 is about 277.7277107216.

The spelling of 21421883 in words is "twenty-one million, four hundred twenty-one thousand, eight hundred eighty-three".