21520714 has 4 divisors (see below), whose sum is σ = 32281074. Its totient is φ = 10760356.

The previous prime is 21520699. The next prime is 21520721. The reversal of 21520714 is 41702512.

It is a happy number.

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., 16605625 + 4915089 = 4075^2 + 2217^2 .

It is a super-2 number, since 2×21520714² = 926282262139592, 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, 5380177 + ... + 5380180.

Almost surely, 2^21520714 is an apocalyptic number.

21520714 is a deficient number, since it is larger than the sum of its proper divisors (10760360).

21520714 is a wasteful number, since it uses less digits than its factorization.

21520714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760359.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21520714 is about 4639.0423580735. The cubic root of 21520714 is about 278.1541594475.

The spelling of 21520714 in words is "twenty-one million, five hundred twenty thousand, seven hundred fourteen".