20421132142601 has 4 divisors (see below), whose sum is σ = 20437967372292. Its totient is φ = 20404296912912.

The previous prime is 20421132142589. The next prime is 20421132142637. The reversal of 20421132142601 is 10624123112402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2412787489225 + 18008344653376 = 1553315^2 + 4243624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20421132142601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421132142651) 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, 8417613026 + ... + 8417615451.

It is an arithmetic number, because the mean of its divisors is an integer number (5109491843073).

Almost surely, 2^{20421132142601} is an apocalyptic number.

It is an amenable number.

20421132142601 is a deficient number, since it is larger than the sum of its proper divisors (16835229691).

20421132142601 is a wasteful number, since it uses less digits than its factorization.

20421132142601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16835229690.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 20421132142601 in words is "twenty trillion, four hundred twenty-one billion, one hundred thirty-two million, one hundred forty-two thousand, six hundred one".