21674376 has 48 divisors (see below), whose sum is σ = 58918860. Its totient is φ = 7198080.

The previous prime is 21674351. The next prime is 21674377. The reversal of 21674376 is 67347612.

21674376 is a `hidden beast` number, since 216 + 7 + 437 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20520900 + 1153476 = 4530^2 + 1074^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21674376.

It is not an unprimeable number, because it can be changed into a prime (21674377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32866 + ... + 33518.

Almost surely, 2^21674376 is an apocalyptic number.

It is an amenable number.

21674376 is an abundant number, since it is smaller than the sum of its proper divisors (37244484).

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

21674376 is a wasteful number, since it uses less digits than its factorization.

21674376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126 (or 1119 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 21674376 is about 4655.5747228457. The cubic root of 21674376 is about 278.8146145800.

The spelling of 21674376 in words is "twenty-one million, six hundred seventy-four thousand, three hundred seventy-six".