21456525514 has 4 divisors (see below), whose sum is σ = 32184788274. Its totient is φ = 10728262756.

The previous prime is 21456525491. The next prime is 21456525521. The reversal of 21456525514 is 41552565412.

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., 11721743289 + 9734782225 = 108267^2 + 98665^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5364131377 + ... + 5364131380.

Almost surely, 2^21456525514 is an apocalyptic number.

21456525514 is a deficient number, since it is larger than the sum of its proper divisors (10728262760).

21456525514 is a wasteful number, since it uses less digits than its factorization.

21456525514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728262759.

The product of its digits is 240000, while the sum is 40.

The spelling of 21456525514 in words is "twenty-one billion, four hundred fifty-six million, five hundred twenty-five thousand, five hundred fourteen".