202101101012221 has 4 divisors (see below), whose sum is σ = 204102102012444. Its totient is φ = 200100100012000.

The previous prime is 202101101012147. The next prime is 202101101012269. The reversal of 202101101012221 is 122210101101202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 138917457005625 + 63183644006596 = 11786325^2 + 7948814^2 .

It is a cyclic number.

It is not a de Polignac number, because 202101101012221 - 2²¹ = 202101098915069 is a prime.

It is a super-2 number, since 2×202101101012221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202101101012195 and 202101101012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101101019221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000500499960 + ... + 1000500500161.

It is an arithmetic number, because the mean of its divisors is an integer number (51025525503111).

Almost surely, 2^{202101101012221} is an apocalyptic number.

It is an amenable number.

202101101012221 is a deficient number, since it is larger than the sum of its proper divisors (2001001000223).

202101101012221 is a wasteful number, since it uses less digits than its factorization.

202101101012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001001000222.

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

Adding to 202101101012221 its reverse (122210101101202), we get a palindrome (324311202113423).

The spelling of 202101101012221 in words is "two hundred two trillion, one hundred one billion, one hundred one million, twelve thousand, two hundred twenty-one".