21421682 has 8 divisors (see below), whose sum is σ = 33169152. Its totient is φ = 10365300.

The previous prime is 21421681. The next prime is 21421693. The reversal of 21421682 is 28612412.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21421681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172694 + ... + 172817.

It is an arithmetic number, because the mean of its divisors is an integer number (4146144).

Almost surely, 2^21421682 is an apocalyptic number.

21421682 is a deficient number, since it is larger than the sum of its proper divisors (11747470).

21421682 is a wasteful number, since it uses less digits than its factorization.

21421682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345544.

The product of its digits is 1536, while the sum is 26.

The square root of 21421682 is about 4628.3562957059. The cubic root of 21421682 is about 277.7268420858.

The spelling of 21421682 in words is "twenty-one million, four hundred twenty-one thousand, six hundred eighty-two".