21302454 has 16 divisors (see below), whose sum is σ = 43756848. Its totient is φ = 6908832.

The previous prime is 21302447. The next prime is 21302459. The reversal of 21302454 is 45420312.

It is a self number, because there is not a number n which added to its sum of digits gives 21302454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302459) 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, 47757 + ... + 48200.

It is an arithmetic number, because the mean of its divisors is an integer number (2734803).

Almost surely, 2^21302454 is an apocalyptic number.

21302454 is an abundant number, since it is smaller than the sum of its proper divisors (22454394).

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

21302454 is a wasteful number, since it uses less digits than its factorization.

21302454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95999.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21302454 is about 4615.4581571064. The cubic root of 21302454 is about 277.2106292866.

Adding to 21302454 its reverse (45420312), we get a palindrome (66722766).

The spelling of 21302454 in words is "twenty-one million, three hundred two thousand, four hundred fifty-four".