21369674 has 4 divisors (see below), whose sum is σ = 32054514. Its totient is φ = 10684836.

The previous prime is 21369659. The next prime is 21369679. The reversal of 21369674 is 47696312.

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., 19140625 + 2229049 = 4375^2 + 1493^2 .

It is not an unprimeable number, because it can be changed into a prime (21369679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5342417 + ... + 5342420.

Almost surely, 2^21369674 is an apocalyptic number.

21369674 is a deficient number, since it is larger than the sum of its proper divisors (10684840).

21369674 is a wasteful number, since it uses less digits than its factorization.

21369674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10684839.

The product of its digits is 54432, while the sum is 38.

The square root of 21369674 is about 4622.7344721496. The cubic root of 21369674 is about 277.5019029710.

The spelling of 21369674 in words is "twenty-one million, three hundred sixty-nine thousand, six hundred seventy-four".