20421301402501 has 8 divisors (see below), whose sum is σ = 20509129966104. Its totient is φ = 20333474407680.

The previous prime is 20421301402499. The next prime is 20421301402519. The reversal of 20421301402501 is 10520410312402.

It can be written as a sum of positive squares in 4 ways, for example, as 2335402276 + 20418966000225 = 48326^2 + 4518735^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20421301402501 - 2¹ = 20421301402499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421301472501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31134391 + ... + 31783531.

It is an arithmetic number, because the mean of its divisors is an integer number (2563641245763).

Almost surely, 2^{20421301402501} is an apocalyptic number.

It is an amenable number.

20421301402501 is a deficient number, since it is larger than the sum of its proper divisors (87828563603).

20421301402501 is a wasteful number, since it uses less digits than its factorization.

20421301402501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784391.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 20421301402501 its reverse (10520410312402), we get a palindrome (30941711714903).

The spelling of 20421301402501 in words is "twenty trillion, four hundred twenty-one billion, three hundred one million, four hundred two thousand, five hundred one".