21074546 has 4 divisors (see below), whose sum is σ = 31611822. Its totient is φ = 10537272.

The previous prime is 21074527. The next prime is 21074569. The reversal of 21074546 is 64547012.

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., 21058921 + 15625 = 4589^2 + 125^2 .

It is a super-2 number, since 2×21074546² = 888272978212232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5268635 + ... + 5268638.

Almost surely, 2^21074546 is an apocalyptic number.

21074546 is a deficient number, since it is larger than the sum of its proper divisors (10537276).

21074546 is a wasteful number, since it uses less digits than its factorization.

21074546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10537275.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 21074546 is about 4590.7021249478. The cubic root of 21074546 is about 276.2184872908.

The spelling of 21074546 in words is "twenty-one million, seventy-four thousand, five hundred forty-six".