21710016 has 42 divisors (see below), whose sum is σ = 62229492. Its totient is φ = 7236480.

The previous prime is 21710011. The next prime is 21710021. The reversal of 21710016 is 61001712.

It is an interprime number because it is at equal distance from previous prime (21710011) and next prime (21710021).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21710011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18270 + ... + 19421.

Almost surely, 2^21710016 is an apocalyptic number.

It is an amenable number.

21710016 is an abundant number, since it is smaller than the sum of its proper divisors (40519476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21710016 is a wasteful number, since it uses less digits than its factorization.

21710016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37709 (or 37696 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 21710016 is about 4659.4008198480. The cubic root of 21710016 is about 278.9673527144.

Adding to 21710016 its reverse (61001712), we get a palindrome (82711728).

The spelling of 21710016 in words is "twenty-one million, seven hundred ten thousand, sixteen".