202100211011221 has 8 divisors (see below), whose sum is σ = 202195917195800. Its totient is φ = 202004506851840.

The previous prime is 202100211011161. The next prime is 202100211011227. The reversal of 202100211011221 is 122110112001202.

It can be written as a sum of positive squares in 4 ways, for example, as 94917962482225 + 107182248528996 = 9742585^2 + 10352886^2 .

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 202100211011221 - 2¹⁵ = 202100210978453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202100211011195 and 202100211011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100211011227) 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, 222278425 + ... + 223185793.

It is an arithmetic number, because the mean of its divisors is an integer number (25274489649475).

Almost surely, 2^{202100211011221} is an apocalyptic number.

It is an amenable number.

202100211011221 is a deficient number, since it is larger than the sum of its proper divisors (95706184579).

202100211011221 is a wasteful number, since it uses less digits than its factorization.

202100211011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012599.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 202100211011221 its reverse (122110112001202), we get a palindrome (324210323012423).

The spelling of 202100211011221 in words is "two hundred two trillion, one hundred billion, two hundred eleven million, eleven thousand, two hundred twenty-one".