21421676 has 6 divisors (see below), whose sum is σ = 37487940. Its totient is φ = 10710836.

The previous prime is 21421667. The next prime is 21421679. The reversal of 21421676 is 67612412.

It is not an unprimeable number, because it can be changed into a prime (21421679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2677706 + ... + 2677713.

It is an arithmetic number, because the mean of its divisors is an integer number (6247990).

Almost surely, 2^21421676 is an apocalyptic number.

It is an amenable number.

21421676 is a deficient number, since it is larger than the sum of its proper divisors (16066264).

21421676 is a wasteful number, since it uses less digits than its factorization.

21421676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355423 (or 5355421 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 21421676 is about 4628.3556475275. The cubic root of 21421676 is about 277.7268161562.

The spelling of 21421676 in words is "twenty-one million, four hundred twenty-one thousand, six hundred seventy-six".