20421501118175 has 36 divisors (see below), whose sum is σ = 26827200203760. Its totient is φ = 15418497191040.

The previous prime is 20421501118153. The next prime is 20421501118217. The reversal of 20421501118175 is 57181110512402.

It is a happy number.

It is not a de Polignac number, because 20421501118175 - 2³² = 20417206150879 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1928270 + ... + 6675419.

It is an arithmetic number, because the mean of its divisors is an integer number (745200005660).

Almost surely, 2^{20421501118175} is an apocalyptic number.

20421501118175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20421501118175 is a deficient number, since it is larger than the sum of its proper divisors (6405699085585).

20421501118175 is a wasteful number, since it uses less digits than its factorization.

20421501118175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8604000 (or 8603976 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 38.

The spelling of 20421501118175 in words is "twenty trillion, four hundred twenty-one billion, five hundred one million, one hundred eighteen thousand, one hundred seventy-five".