20120421401 has 4 divisors (see below), whose sum is σ = 20664216612. Its totient is φ = 19576626192.

The previous prime is 20120421331. The next prime is 20120421427. The reversal of 20120421401 is 10412402102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10412402102 = 2 ⋅5206201051.

It can be written as a sum of positive squares in 2 ways, for example, as 19502401801 + 618019600 = 139651^2 + 24860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120421401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20120421401.

It is not an unprimeable number, because it can be changed into a prime (20120421301) 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, 271897550 + ... + 271897623.

It is an arithmetic number, because the mean of its divisors is an integer number (5166054153).

Almost surely, 2^20120421401 is an apocalyptic number.

It is an amenable number.

20120421401 is a deficient number, since it is larger than the sum of its proper divisors (543795211).

20120421401 is an equidigital number, since it uses as much as digits as its factorization.

20120421401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543795210.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20120421401 its reverse (10412402102), we get a palindrome (30532823503).

The spelling of 20120421401 in words is "twenty billion, one hundred twenty million, four hundred twenty-one thousand, four hundred one".