21073274 has 4 divisors (see below), whose sum is σ = 31609914. Its totient is φ = 10536636.

The previous prime is 21073271. The next prime is 21073279. The reversal of 21073274 is 47237012.

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., 10608049 + 10465225 = 3257^2 + 3235^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21073271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5268317 + ... + 5268320.

Almost surely, 2^21073274 is an apocalyptic number.

21073274 is a deficient number, since it is larger than the sum of its proper divisors (10536640).

21073274 is a wasteful number, since it uses less digits than its factorization.

21073274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10536639.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 21073274 is about 4590.5635819581. The cubic root of 21073274 is about 276.2129299234.

The spelling of 21073274 in words is "twenty-one million, seventy-three thousand, two hundred seventy-four".