21462818 has 32 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 8971776.

The previous prime is 21462811. The next prime is 21462839. The reversal of 21462818 is 81826412.

It is a happy number.

It is a super-2 number, since 2×21462818² = 921305113002248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21462811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10418 + ... + 12306.

It is an arithmetic number, because the mean of its divisors is an integer number (1190700).

Almost surely, 2^21462818 is an apocalyptic number.

21462818 is a deficient number, since it is larger than the sum of its proper divisors (16639582).

21462818 is a wasteful number, since it uses less digits than its factorization.

21462818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946.

The product of its digits is 6144, while the sum is 32.

The square root of 21462818 is about 4632.7980745981. The cubic root of 21462818 is about 277.9045011247.

The spelling of 21462818 in words is "twenty-one million, four hundred sixty-two thousand, eight hundred eighteen".