21144662 has 16 divisors (see below), whose sum is σ = 39543552. Its totient is φ = 8238120.

The previous prime is 21144661. The next prime is 21144677. The reversal of 21144662 is 26644112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68498 + ... + 68805.

It is an arithmetic number, because the mean of its divisors is an integer number (2471472).

Almost surely, 2^21144662 is an apocalyptic number.

21144662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21144662 is a deficient number, since it is larger than the sum of its proper divisors (18398890).

21144662 is a wasteful number, since it uses less digits than its factorization.

21144662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137323.

The product of its digits is 2304, while the sum is 26.

The square root of 21144662 is about 4598.3325238612. The cubic root of 21144662 is about 276.5244787997.

Adding to 21144662 its reverse (26644112), we get a palindrome (47788774).

It can be divided in two parts, 2114 and 4662, that added together give a palindrome (6776).

The spelling of 21144662 in words is "twenty-one million, one hundred forty-four thousand, six hundred sixty-two".