21717514 has 48 divisors (see below), whose sum is σ = 41214528. Its totient is φ = 8401536.

The previous prime is 21717473. The next prime is 21717523. The reversal of 21717514 is 41571712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158454 + ... + 158590.

It is an arithmetic number, because the mean of its divisors is an integer number (858636).

Almost surely, 2^21717514 is an apocalyptic number.

21717514 is a deficient number, since it is larger than the sum of its proper divisors (19497014).

21717514 is a wasteful number, since it uses less digits than its factorization.

21717514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 226 counting only the distinct ones).

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

The square root of 21717514 is about 4660.2053602819. The cubic root of 21717514 is about 278.9994647198. Note that the first 3 decimals are identical.

The spelling of 21717514 in words is "twenty-one million, seven hundred seventeen thousand, five hundred fourteen".