21241896516 has 63 divisors (see below), whose sum is σ = 55755139951. Its totient is φ = 7078008744.

The previous prime is 21241896503. The next prime is 21241896541. The reversal of 21241896516 is 61569814212.

The square root of 21241896516 is 145746.

It is a perfect power (a square), and thus also a powerful number.

21241896516 is a `hidden beast` number, since 2 + 1 + 2 + 41 + 8 + 96 + 516 = 666.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 7868935 + ... + 7871633.

Almost surely, 2^21241896516 is an apocalyptic number.

21241896516 is the 145746-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21241896516

21241896516 is an abundant number, since it is smaller than the sum of its proper divisors (34513243435).

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

21241896516 is an frugal number, since it uses more digits than its factorization.

21241896516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420 (or 2704 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 21241896516 in words is "twenty-one billion, two hundred forty-one million, eight hundred ninety-six thousand, five hundred sixteen".