21500074 has 4 divisors (see below), whose sum is σ = 32250114. Its totient is φ = 10750036.

The previous prime is 21500069. The next prime is 21500111. The reversal of 21500074 is 47000512.

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., 21224449 + 275625 = 4607^2 + 525^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5375017 + ... + 5375020.

Almost surely, 2^21500074 is an apocalyptic number.

21500074 is a deficient number, since it is larger than the sum of its proper divisors (10750040).

21500074 is a wasteful number, since it uses less digits than its factorization.

21500074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10750039.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21500074 is about 4636.8172273662. The cubic root of 21500074 is about 278.0652073459.

Adding to 21500074 its reverse (47000512), we get a palindrome (68500586).

The spelling of 21500074 in words is "twenty-one million, five hundred thousand, seventy-four".