21662014 has 32 divisors (see below), whose sum is σ = 38620800. Its totient is φ = 9001440.

The previous prime is 21661999. The next prime is 21662041. The reversal of 21662014 is 41026612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11229 + ... + 13015.

It is an arithmetic number, because the mean of its divisors is an integer number (1206900).

Almost surely, 2^21662014 is an apocalyptic number.

21662014 is a deficient number, since it is larger than the sum of its proper divisors (16958786).

21662014 is a wasteful number, since it uses less digits than its factorization.

21662014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21662014 is about 4654.2468778525. The cubic root of 21662014 is about 278.7615971098.

Adding to 21662014 its reverse (41026612), we get a palindrome (62688626).

The spelling of 21662014 in words is "twenty-one million, six hundred sixty-two thousand, fourteen".