20401230424121 has 4 divisors (see below), whose sum is σ = 20401318025700. Its totient is φ = 20401142822544.

The previous prime is 20401230424063. The next prime is 20401230424177. The reversal of 20401230424121 is 12142403210402.

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 5074044574096 + 15327185850025 = 2252564^2 + 3914995^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401230424121 - 2¹⁰ = 20401230423097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401230424721) 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, 43450526 + ... + 43917543.

It is an arithmetic number, because the mean of its divisors is an integer number (5100329506425).

Almost surely, 2^{20401230424121} is an apocalyptic number.

It is an amenable number.

20401230424121 is a deficient number, since it is larger than the sum of its proper divisors (87601579).

20401230424121 is an equidigital number, since it uses as much as digits as its factorization.

20401230424121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87601578.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 20401230424121 its reverse (12142403210402), we get a palindrome (32543633634523).

The spelling of 20401230424121 in words is "twenty trillion, four hundred one billion, two hundred thirty million, four hundred twenty-four thousand, one hundred twenty-one".