21453514 has 4 divisors (see below), whose sum is σ = 32180274. Its totient is φ = 10726756.

The previous prime is 21453493. The next prime is 21453529. The reversal of 21453514 is 41535412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17181025 + 4272489 = 4145^2 + 2067^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363377 + ... + 5363380.

Almost surely, 2^21453514 is an apocalyptic number.

21453514 is a deficient number, since it is larger than the sum of its proper divisors (10726760).

21453514 is a wasteful number, since it uses less digits than its factorization.

21453514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10726759.

The product of its digits is 2400, while the sum is 25.

The square root of 21453514 is about 4631.7938209726. The cubic root of 21453514 is about 277.8643386883.

Adding to 21453514 its reverse (41535412), we get a palindrome (62988926).

The spelling of 21453514 in words is "twenty-one million, four hundred fifty-three thousand, five hundred fourteen".