21110412 has 24 divisors (see below), whose sum is σ = 51399936. Its totient is φ = 6730768.

The previous prime is 21110393. The next prime is 21110423. The reversal of 21110412 is 21401112.

It is a happy number.

It is a super-3 number, since 3×21110412³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 37968 + ... + 38519.

It is an arithmetic number, because the mean of its divisors is an integer number (2141664).

Almost surely, 2^21110412 is an apocalyptic number.

It is an amenable number.

21110412 is an abundant number, since it is smaller than the sum of its proper divisors (30289524).

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

21110412 is a wasteful number, since it uses less digits than its factorization.

21110412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76517 (or 76515 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21110412 is about 4594.6068384575. The cubic root of 21110412 is about 276.3750938678.

Adding to 21110412 its reverse (21401112), we get a palindrome (42511524).

The spelling of 21110412 in words is "twenty-one million, one hundred ten thousand, four hundred twelve".