21440462 has 16 divisors (see below), whose sum is σ = 33772032. Its totient is φ = 10189080.

The previous prime is 21440453. The next prime is 21440473. The reversal of 21440462 is 26404412.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6287 + ... + 9077.

It is an arithmetic number, because the mean of its divisors is an integer number (2110752).

Almost surely, 2^21440462 is an apocalyptic number.

21440462 is a deficient number, since it is larger than the sum of its proper divisors (12331570).

21440462 is a wasteful number, since it uses less digits than its factorization.

21440462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 21440462 is about 4630.3846492489. The cubic root of 21440462 is about 277.8079777417.

Adding to 21440462 its reverse (26404412), we get a palindrome (47844874).

The spelling of 21440462 in words is "twenty-one million, four hundred forty thousand, four hundred sixty-two".