21714761 has 4 divisors (see below), whose sum is σ = 21735552. Its totient is φ = 21693972.

The previous prime is 21714733. The next prime is 21714779. The reversal of 21714761 is 16741712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21714761 - 2¹⁰ = 21713737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21714961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8741 + ... + 10946.

It is an arithmetic number, because the mean of its divisors is an integer number (5433888).

Almost surely, 2^21714761 is an apocalyptic number.

It is an amenable number.

21714761 is a deficient number, since it is larger than the sum of its proper divisors (20791).

21714761 is a wasteful number, since it uses less digits than its factorization.

21714761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20790.

The product of its digits is 2352, while the sum is 29.

The square root of 21714761 is about 4659.9099776712. The cubic root of 21714761 is about 278.9876751877.

The spelling of 21714761 in words is "twenty-one million, seven hundred fourteen thousand, seven hundred sixty-one".