21153514 has 16 divisors (see below), whose sum is σ = 33534720. Its totient is φ = 9987120.

The previous prime is 21153497. The next prime is 21153533. The reversal of 21153514 is 41535112.

It is a happy number.

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, 724 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (2095920).

Almost surely, 2^21153514 is an apocalyptic number.

21153514 is a deficient number, since it is larger than the sum of its proper divisors (12381206).

21153514 is a wasteful number, since it uses less digits than its factorization.

21153514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5925.

The product of its digits is 600, while the sum is 22.

The square root of 21153514 is about 4599.2949459673. The cubic root of 21153514 is about 276.5630614797.

Adding to 21153514 its reverse (41535112), we get a palindrome (62688626).

The spelling of 21153514 in words is "twenty-one million, one hundred fifty-three thousand, five hundred fourteen".