21351674 has 4 divisors (see below), whose sum is σ = 32027514. Its totient is φ = 10675836.

The previous prime is 21351661. The next prime is 21351679. The reversal of 21351674 is 47615312.

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., 12201049 + 9150625 = 3493^2 + 3025^2 .

It is not an unprimeable number, because it can be changed into a prime (21351679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5337917 + ... + 5337920.

Almost surely, 2^21351674 is an apocalyptic number.

21351674 is a deficient number, since it is larger than the sum of its proper divisors (10675840).

21351674 is a wasteful number, since it uses less digits than its factorization.

21351674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10675839.

The product of its digits is 5040, while the sum is 29.

The square root of 21351674 is about 4620.7871623783. The cubic root of 21351674 is about 277.4239663996.

Adding to 21351674 its reverse (47615312), we get a palindrome (68966986).

The spelling of 21351674 in words is "twenty-one million, three hundred fifty-one thousand, six hundred seventy-four".