10202001111221 has 4 divisors (see below), whose sum is σ = 10202239668972. Its totient is φ = 10201762553472.

The previous prime is 10202001111173. The next prime is 10202001111319. The reversal of 10202001111221 is 12211110020201.

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 4447332676900 + 5754668434321 = 2108870^2 + 2398889^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202001111221 - 2¹⁸ = 10202000849077 is a prime.

It is a super-2 number, since 2×10202001111221² (a number of 27 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 = 10202001111196 and 10202001111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202001117221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119214716 + ... + 119300261.

It is an arithmetic number, because the mean of its divisors is an integer number (2550559917243).

Almost surely, 2^{10202001111221} is an apocalyptic number.

It is an amenable number.

10202001111221 is a deficient number, since it is larger than the sum of its proper divisors (238557751).

10202001111221 is an equidigital number, since it uses as much as digits as its factorization.

10202001111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238557750.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10202001111221 its reverse (12211110020201), we get a palindrome (22413111131422).

The spelling of 10202001111221 in words is "ten trillion, two hundred two billion, one million, one hundred eleven thousand, two hundred twenty-one".