20421523220113 has 8 divisors (see below), whose sum is σ = 20477548142208. Its totient is φ = 20365500366384.

The previous prime is 20421523220099. The next prime is 20421523220123. The reversal of 20421523220113 is 31102232512402.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20421523220113 is a prime.

It is a super-2 number, since 2×20421523220113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421523220123) 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, 20416995 + ... + 21393847.

It is an arithmetic number, because the mean of its divisors is an integer number (2559693517776).

Almost surely, 2^{20421523220113} is an apocalyptic number.

It is an amenable number.

20421523220113 is a deficient number, since it is larger than the sum of its proper divisors (56024922095).

20421523220113 is an equidigital number, since it uses as much as digits as its factorization.

20421523220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034183.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 20421523220113 its reverse (31102232512402), we get a palindrome (51523755732515).

The spelling of 20421523220113 in words is "twenty trillion, four hundred twenty-one billion, five hundred twenty-three million, two hundred twenty thousand, one hundred thirteen".