20033121001221 has 6 divisors (see below), whose sum is σ = 28936730335110. Its totient is φ = 13355414000808.

The previous prime is 20033121001169. The next prime is 20033121001253. The reversal of 20033121001221 is 12210012133002.

20033121001221 is a `hidden beast` number, since 2 + 0 + 0 + 331 + 210 + 0 + 122 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13389671456100 + 6643449545121 = 3659190^2 + 2577489^2 .

It is not a de Polignac number, because 20033121001221 - 2¹⁹ = 20033120476933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20033121001194 and 20033121001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20033121051221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112951166726 + ... + 1112951166743.

It is an arithmetic number, because the mean of its divisors is an integer number (4822788389185).

Almost surely, 2^{20033121001221} is an apocalyptic number.

It is an amenable number.

20033121001221 is a deficient number, since it is larger than the sum of its proper divisors (8903609333889).

20033121001221 is a wasteful number, since it uses less digits than its factorization.

20033121001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225902333475 (or 2225902333472 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20033121001221 its reverse (12210012133002), we get a palindrome (32243133134223).

The spelling of 20033121001221 in words is "twenty trillion, thirty-three billion, one hundred twenty-one million, one thousand, two hundred twenty-one".