21241270716 has 24 divisors (see below), whose sum is σ = 49775688144. Its totient is φ = 7050034560.

The previous prime is 21241270709. The next prime is 21241270727. The reversal of 21241270716 is 61707214212.

It is a congruent 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, 3795715 + ... + 3801306.

It is an arithmetic number, because the mean of its divisors is an integer number (2073987006).

Almost surely, 2^21241270716 is an apocalyptic number.

It is an amenable number.

21241270716 is an abundant number, since it is smaller than the sum of its proper divisors (28534417428).

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

21241270716 is a wasteful number, since it uses less digits than its factorization.

21241270716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7597261 (or 7597259 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

Adding to 21241270716 its reverse (61707214212), we get a palindrome (82948484928).

It can be divided in two parts, 212412 and 70716, that added together give a triangular number (283128 = T₇₅₂).

The spelling of 21241270716 in words is "twenty-one billion, two hundred forty-one million, two hundred seventy thousand, seven hundred sixteen".