21246121374108 has 12 divisors (see below), whose sum is σ = 49574283206280. Its totient is φ = 7082040458032.

The previous prime is 21246121374103. The next prime is 21246121374119. The reversal of 21246121374108 is 80147312164212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21246121374108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246121374103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885255057243 + ... + 885255057266.

It is an arithmetic number, because the mean of its divisors is an integer number (4131190267190).

Almost surely, 2^{21246121374108} is an apocalyptic number.

It is an amenable number.

21246121374108 is an abundant number, since it is smaller than the sum of its proper divisors (28328161832172).

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

21246121374108 is a wasteful number, since it uses less digits than its factorization.

21246121374108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770510114516 (or 1770510114514 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The spelling of 21246121374108 in words is "twenty-one trillion, two hundred forty-six billion, one hundred twenty-one million, three hundred seventy-four thousand, one hundred eight".