20421523220141 has 8 divisors (see below), whose sum is σ = 21624654016440. Its totient is φ = 19218599615488.

The previous prime is 20421523220123. The next prime is 20421523220177. The reversal of 20421523220141 is 14102232512402.

It can be written as a sum of positive squares in 4 ways, for example, as 7342089317641 + 13079433902500 = 2709629^2 + 3616550^2 .

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 20421523220141 - 2²² = 20421519025837 is a prime.

It is a super-2 number, since 2×20421523220141² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421523220341) 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, 51594956 + ... + 51989253.

It is an arithmetic number, because the mean of its divisors is an integer number (2703081752055).

Almost surely, 2^{20421523220141} is an apocalyptic number.

It is an amenable number.

20421523220141 is a deficient number, since it is larger than the sum of its proper divisors (1203130796299).

20421523220141 is a wasteful number, since it uses less digits than its factorization.

20421523220141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103595823.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 20421523220141 its reverse (14102232512402), we get a palindrome (34523755732543).

The spelling of 20421523220141 in words is "twenty trillion, four hundred twenty-one billion, five hundred twenty-three million, two hundred twenty thousand, one hundred forty-one".