200202121001221 has 16 divisors (see below), whose sum is σ = 215981778100464. Its totient is φ = 184867362561024.

The previous prime is 200202121001219. The next prime is 200202121001227. The reversal of 200202121001221 is 122100121202002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9682459072225 + 190519661928996 = 3111665^2 + 13802886^2 .

It is a cyclic number.

It is not a de Polignac number, because 200202121001221 - 2¹ = 200202121001219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200202121001195 and 200202121001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200202121001227) 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, 55457395 + ... + 58956991.

It is an arithmetic number, because the mean of its divisors is an integer number (13498861131279).

Almost surely, 2^{200202121001221} is an apocalyptic number.

It is an amenable number.

200202121001221 is a deficient number, since it is larger than the sum of its proper divisors (15779657099243).

200202121001221 is a wasteful number, since it uses less digits than its factorization.

200202121001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563160.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 200202121001221 its reverse (122100121202002), we get a palindrome (322302242203223).

The spelling of 200202121001221 in words is "two hundred trillion, two hundred two billion, one hundred twenty-one million, one thousand, two hundred twenty-one".