21251514454108 has 12 divisors (see below), whose sum is σ = 37191679853832. Its totient is φ = 10625320210160.

The previous prime is 21251514454103. The next prime is 21251514454123. The reversal of 21251514454108 is 80145441515212.

It is a super-2 number, since 2×21251514454108² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21251514454103) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 109144798 + ... + 109339333.

It is an arithmetic number, because the mean of its divisors is an integer number (3099306654486).

Almost surely, 2^{21251514454108} is an apocalyptic number.

It is an amenable number.

21251514454108 is a deficient number, since it is larger than the sum of its proper divisors (15940165399724).

21251514454108 is a wasteful number, since it uses less digits than its factorization.

21251514454108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218508452 (or 218508450 counting only the distinct ones).

The product of its (nonzero) digits is 256000, while the sum is 43.

The spelling of 21251514454108 in words is "twenty-one trillion, two hundred fifty-one billion, five hundred fourteen million, four hundred fifty-four thousand, one hundred eight".