21265499456212 has 12 divisors (see below), whose sum is σ = 40597771689216. Its totient is φ = 9666136116440.

The previous prime is 21265499456197. The next prime is 21265499456297.

21265499456212 is nontrivially palindromic in base 10.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 241653402868 + ... + 241653402955.

It is an arithmetic number, because the mean of its divisors is an integer number (3383147640768).

Almost surely, 2^{21265499456212} is an apocalyptic number.

21265499456212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21265499456212 is a deficient number, since it is larger than the sum of its proper divisors (19332272233004).

21265499456212 is a wasteful number, since it uses less digits than its factorization.

21265499456212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483306805838 (or 483306805836 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 58.

The spelling of 21265499456212 in words is "twenty-one trillion, two hundred sixty-five billion, four hundred ninety-nine million, four hundred fifty-six thousand, two hundred twelve".