21452418 has 32 divisors (see below), whose sum is σ = 51340800. Its totient is φ = 6600528.

The previous prime is 21452413. The next prime is 21452443. The reversal of 21452418 is 81425412.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21452391 and 21452400.

It is not an unprimeable number, because it can be changed into a prime (21452411) 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 15 ways as a sum of consecutive naturals, for example, 14578 + ... + 15981.

It is an arithmetic number, because the mean of its divisors is an integer number (1604400).

Almost surely, 2^21452418 is an apocalyptic number.

21452418 is an abundant number, since it is smaller than the sum of its proper divisors (29888382).

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

21452418 is a wasteful number, since it uses less digits than its factorization.

21452418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30583 (or 30577 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21452418 is about 4631.6755067686. The cubic root of 21452418 is about 277.8596068372.

The spelling of 21452418 in words is "twenty-one million, four hundred fifty-two thousand, four hundred eighteen".