21711712 has 24 divisors (see below), whose sum is σ = 46631592. Its totient is φ = 9868800.

The previous prime is 21711709. The next prime is 21711713.

21711712 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30489 + ... + 31192.

It is an arithmetic number, because the mean of its divisors is an integer number (1942983).

Almost surely, 2^21711712 is an apocalyptic number.

21711712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21711712 is an abundant number, since it is smaller than the sum of its proper divisors (24919880).

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

21711712 is a wasteful number, since it uses less digits than its factorization.

21711712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61702 (or 61694 counting only the distinct ones).

The product of its digits is 196, while the sum is 22.

The square root of 21711712 is about 4659.5828139438. The cubic root of 21711712 is about 278.9746168931.

It can be divided in two parts, 2171 and 1712, that added together give a palindrome (3883).

The spelling of 21711712 in words is "twenty-one million, seven hundred eleven thousand, seven hundred twelve".