21371662 has 16 divisors (see below), whose sum is σ = 34710480. Its totient is φ = 9810432.

The previous prime is 21371657. The next prime is 21371663. The reversal of 21371662 is 26617312.

It is a self number, because there is not a number n which added to its sum of digits gives 21371662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371663) 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 7 ways as a sum of consecutive naturals, for example, 2889 + ... + 7147.

It is an arithmetic number, because the mean of its divisors is an integer number (2169405).

Almost surely, 2^21371662 is an apocalyptic number.

21371662 is a deficient number, since it is larger than the sum of its proper divisors (13338818).

21371662 is a wasteful number, since it uses less digits than its factorization.

21371662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4467.

The product of its digits is 3024, while the sum is 28.

The square root of 21371662 is about 4622.9494913962. The cubic root of 21371662 is about 277.5105079483.

Adding to 21371662 its reverse (26617312), we get a palindrome (47988974).

The spelling of 21371662 in words is "twenty-one million, three hundred seventy-one thousand, six hundred sixty-two".