21504114 has 24 divisors (see below), whose sum is σ = 47473452. Its totient is φ = 7032480.

The previous prime is 21504107. The next prime is 21504137. The reversal of 21504114 is 41140512.

It can be written as a sum of positive squares in 2 ways, for example, as 19954089 + 1550025 = 4467^2 + 1245^2 .

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

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, 10317 + ... + 12224.

Almost surely, 2^21504114 is an apocalyptic number.

21504114 is an abundant number, since it is smaller than the sum of its proper divisors (25969338).

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

21504114 is a wasteful number, since it uses less digits than its factorization.

21504114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22602 (or 22599 counting only the distinct ones).

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

The square root of 21504114 is about 4637.2528505571. The cubic root of 21504114 is about 278.0826229926.

Adding to 21504114 its reverse (41140512), we get a palindrome (62644626).

The spelling of 21504114 in words is "twenty-one million, five hundred four thousand, one hundred fourteen".