21872674 has 4 divisors (see below), whose sum is σ = 32809014. Its totient is φ = 10936336.

The previous prime is 21872663. The next prime is 21872689. The reversal of 21872674 is 47627812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 1306449 = 4535^2 + 1143^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5468167 + ... + 5468170.

Almost surely, 2^21872674 is an apocalyptic number.

21872674 is a deficient number, since it is larger than the sum of its proper divisors (10936340).

21872674 is a wasteful number, since it uses less digits than its factorization.

21872674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10936339.

The product of its digits is 37632, while the sum is 37.

The square root of 21872674 is about 4676.8230669975. The cubic root of 21872674 is about 279.6623225195.

The spelling of 21872674 in words is "twenty-one million, eight hundred seventy-two thousand, six hundred seventy-four".