21405114 has 32 divisors (see below), whose sum is σ = 47736000. Its totient is φ = 7109712.

The previous prime is 21405113. The next prime is 21405121. The reversal of 21405114 is 41150412.

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

It is not an unprimeable number, because it can be changed into a prime (21405113) 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, 20497 + ... + 21515.

It is an arithmetic number, because the mean of its divisors is an integer number (1491750).

Almost surely, 2^21405114 is an apocalyptic number.

21405114 is an abundant number, since it is smaller than the sum of its proper divisors (26330886).

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

21405114 is a wasteful number, since it uses less digits than its factorization.

21405114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1413 counting only the distinct ones).

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

The square root of 21405114 is about 4626.5661132205. The cubic root of 21405114 is about 277.6552236028.

Adding to 21405114 its reverse (41150412), we get a palindrome (62555526).

The spelling of 21405114 in words is "twenty-one million, four hundred five thousand, one hundred fourteen".