20320010121221 has 16 divisors (see below), whose sum is σ = 21819650151168. Its totient is φ = 18854218656000.

The previous prime is 20320010121217. The next prime is 20320010121239. The reversal of 20320010121221 is 12212101002302.

It is a cyclic number.

It is not a de Polignac number, because 20320010121221 - 2² = 20320010121217 is a prime.

It is a super-2 number, since 2×20320010121221² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 20320010121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320010121211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19901456 + ... + 20897558.

It is an arithmetic number, because the mean of its divisors is an integer number (1363728134448).

Almost surely, 2^{20320010121221} is an apocalyptic number.

It is an amenable number.

20320010121221 is a deficient number, since it is larger than the sum of its proper divisors (1499640029947).

20320010121221 is a wasteful number, since it uses less digits than its factorization.

20320010121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013092.

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

Adding to 20320010121221 its reverse (12212101002302), we get a palindrome (32532111123523).

The spelling of 20320010121221 in words is "twenty trillion, three hundred twenty billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".