21676554 has 24 divisors (see below), whose sum is σ = 47244132. Its totient is φ = 7182720.

The previous prime is 21676553. The next prime is 21676579. The reversal of 21676554 is 45567612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18533025 + 3143529 = 4305^2 + 1773^2 .

It is not an unprimeable number, because it can be changed into a prime (21676553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 367 + ... + 6594.

Almost surely, 2^21676554 is an apocalyptic number.

21676554 is an abundant number, since it is smaller than the sum of its proper divisors (25567578).

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

21676554 is a wasteful number, since it uses less digits than its factorization.

21676554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142 (or 7139 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 21676554 is about 4655.8086300878. The cubic root of 21676554 is about 278.8239533785.

The spelling of 21676554 in words is "twenty-one million, six hundred seventy-six thousand, five hundred fifty-four".