21571714 has 4 divisors (see below), whose sum is σ = 32357574. Its totient is φ = 10785856.

The previous prime is 21571673. The next prime is 21571721. The reversal of 21571714 is 41717512.

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., 21316689 + 255025 = 4617^2 + 505^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5392927 + ... + 5392930.

Almost surely, 2^21571714 is an apocalyptic number.

21571714 is a deficient number, since it is larger than the sum of its proper divisors (10785860).

21571714 is a wasteful number, since it uses less digits than its factorization.

21571714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10785859.

The product of its digits is 1960, while the sum is 28.

The square root of 21571714 is about 4644.5359294552. The cubic root of 21571714 is about 278.3737102630.

The spelling of 21571714 in words is "twenty-one million, five hundred seventy-one thousand, seven hundred fourteen".