21105414 has 32 divisors (see below), whose sum is σ = 51166080. Its totient is φ = 6395400.

The previous prime is 21105407. The next prime is 21105419. The reversal of 21105414 is 41450112.

It is a super-2 number, since 2×21105414² = 890877000222792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105419) 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, 17172 + ... + 18359.

It is an arithmetic number, because the mean of its divisors is an integer number (1598940).

Almost surely, 2^21105414 is an apocalyptic number.

21105414 is an abundant number, since it is smaller than the sum of its proper divisors (30060666).

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

21105414 is a wasteful number, since it uses less digits than its factorization.

21105414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35553 (or 35547 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 21105414 is about 4594.0629077103. The cubic root of 21105414 is about 276.3532810653.

Adding to 21105414 its reverse (41450112), we get a palindrome (62555526).

The spelling of 21105414 in words is "twenty-one million, one hundred five thousand, four hundred fourteen".