21253034648708 has 48 divisors (see below), whose sum is σ = 37787408245440. Its totient is φ = 10457967252096.

The previous prime is 21253034648701. The next prime is 21253034648789. The reversal of 21253034648708 is 80784643035212.

It is a self number, because there is not a number n which added to its sum of digits gives 21253034648708.

It is not an unprimeable number, because it can be changed into a prime (21253034648701) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 349187183 + ... + 349248041.

It is an arithmetic number, because the mean of its divisors is an integer number (787237671780).

Almost surely, 2^{21253034648708} is an apocalyptic number.

It is an amenable number.

21253034648708 is a deficient number, since it is larger than the sum of its proper divisors (16534373596732).

21253034648708 is a wasteful number, since it uses less digits than its factorization.

21253034648708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66324 (or 66322 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 21253034648708 in words is "twenty-one trillion, two hundred fifty-three billion, thirty-four million, six hundred forty-eight thousand, seven hundred eight".