21712696 has 8 divisors (see below), whose sum is σ = 40711320. Its totient is φ = 10856344.

The previous prime is 21712681. The next prime is 21712697. The reversal of 21712696 is 69621712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712697) 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 as a sum of consecutive naturals, namely, 1357036 + ... + 1357051.

It is an arithmetic number, because the mean of its divisors is an integer number (5088915).

Almost surely, 2^21712696 is an apocalyptic number.

It is an amenable number.

21712696 is a deficient number, since it is larger than the sum of its proper divisors (18998624).

21712696 is a wasteful number, since it uses less digits than its factorization.

21712696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714093 (or 2714089 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 21712696 is about 4659.6884015994. The cubic root of 21712696 is about 278.9788313140.

The spelling of 21712696 in words is "twenty-one million, seven hundred twelve thousand, six hundred ninety-six".