21264212708 has 6 divisors (see below), whose sum is σ = 37212372246. Its totient is φ = 10632106352.

The previous prime is 21264212699. The next prime is 21264212719. The reversal of 21264212708 is 80721246212.

It can be written as a sum of positive squares in only one way, i.e., 17988710884 + 3275501824 = 134122^2 + 57232^2 .

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 as a sum of consecutive naturals, namely, 2658026585 + ... + 2658026592.

It is an arithmetic number, because the mean of its divisors is an integer number (6202062041).

Almost surely, 2^21264212708 is an apocalyptic number.

It is an amenable number.

21264212708 is a deficient number, since it is larger than the sum of its proper divisors (15948159538).

21264212708 is a wasteful number, since it uses less digits than its factorization.

21264212708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316053181 (or 5316053179 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The spelling of 21264212708 in words is "twenty-one billion, two hundred sixty-four million, two hundred twelve thousand, seven hundred eight".