21193458315121 has 4 divisors (see below), whose sum is σ = 21193632223744. Its totient is φ = 21193284406500.

The previous prime is 21193458315103. The next prime is 21193458315191. The reversal of 21193458315121 is 12151385439112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21193458315121 - 2³⁵ = 21159098576753 is a prime.

It is a super-2 number, since 2×21193458315121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21193458315191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86771385 + ... + 87015286.

It is an arithmetic number, because the mean of its divisors is an integer number (5298408055936).

Almost surely, 2^{21193458315121} is an apocalyptic number.

It is an amenable number.

21193458315121 is a deficient number, since it is larger than the sum of its proper divisors (173908623).

21193458315121 is a wasteful number, since it uses less digits than its factorization.

21193458315121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173908622.

The product of its digits is 259200, while the sum is 46.

The spelling of 21193458315121 in words is "twenty-one trillion, one hundred ninety-three billion, four hundred fifty-eight million, three hundred fifteen thousand, one hundred twenty-one".