20421100020113 has 4 divisors (see below), whose sum is σ = 21991953867828. Its totient is φ = 18850246172400.

The previous prime is 20421100020017. The next prime is 20421100020149. The reversal of 20421100020113 is 31102000112402.

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 5246701762624 + 15174398257489 = 2290568^2 + 3895433^2 .

It is a cyclic number.

It is not a de Polignac number, because 20421100020113 - 2⁸ = 20421100019857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20421100020091 and 20421100020100.

It is not an unprimeable number, because it can be changed into a prime (20421100020193) 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, 785426923838 + ... + 785426923863.

It is an arithmetic number, because the mean of its divisors is an integer number (5497988466957).

Almost surely, 2^{20421100020113} is an apocalyptic number.

It is an amenable number.

20421100020113 is a deficient number, since it is larger than the sum of its proper divisors (1570853847715).

20421100020113 is a wasteful number, since it uses less digits than its factorization.

20421100020113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570853847714.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20421100020113 its reverse (31102000112402), we get a palindrome (51523100132515).

The spelling of 20421100020113 in words is "twenty trillion, four hundred twenty-one billion, one hundred million, twenty thousand, one hundred thirteen".