21714012 has 36 divisors (see below), whose sum is σ = 56661696. Its totient is φ = 7004160.

The previous prime is 21713983. The next prime is 21714013. The reversal of 21714012 is 21041712.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21714012² = 942996634272288, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21714013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8613 + ... + 10844.

It is an arithmetic number, because the mean of its divisors is an integer number (1573936).

Almost surely, 2^21714012 is an apocalyptic number.

It is an amenable number.

21714012 is an abundant number, since it is smaller than the sum of its proper divisors (34947684).

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

21714012 is a wasteful number, since it uses less digits than its factorization.

21714012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19498 (or 19493 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21714012 is about 4659.8296106188. The cubic root of 21714012 is about 278.9844674746.

Adding to 21714012 its reverse (21041712), we get a palindrome (42755724).

The spelling of 21714012 in words is "twenty-one million, seven hundred fourteen thousand, twelve".