21674748 has 24 divisors (see below), whose sum is σ = 51942352. Its totient is φ = 7029504.

The previous prime is 21674699. The next prime is 21674749. The reversal of 21674748 is 84747612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674749) 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, 23965 + ... + 24852.

Almost surely, 2^21674748 is an apocalyptic number.

It is an amenable number.

21674748 is an abundant number, since it is smaller than the sum of its proper divisors (30267604).

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

21674748 is a wasteful number, since it uses less digits than its factorization.

21674748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48861 (or 48859 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 21674748 is about 4655.6146747771. The cubic root of 21674748 is about 278.8162096808.

It can be divided in two parts, 21674 and 748, that added together give a palindrome (22422).

The spelling of 21674748 in words is "twenty-one million, six hundred seventy-four thousand, seven hundred forty-eight".