21412818 has 24 divisors (see below), whose sum is σ = 53022528. Its totient is φ = 6117912.

The previous prime is 21412801. The next prime is 21412823. The reversal of 21412818 is 81821412.

It is a super-2 number, since 2×21412818² = 917017549402248, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21412791 and 21412800.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84846 + ... + 85097.

It is an arithmetic number, because the mean of its divisors is an integer number (2209272).

Almost surely, 2^21412818 is an apocalyptic number.

21412818 is an abundant number, since it is smaller than the sum of its proper divisors (31609710).

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

21412818 is a wasteful number, since it uses less digits than its factorization.

21412818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169958 (or 169955 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 21412818 is about 4627.3986212558. The cubic root of 21412818 is about 277.6885302738.

The spelling of 21412818 in words is "twenty-one million, four hundred twelve thousand, eight hundred eighteen".