202221010001221 has 8 divisors (see below), whose sum is σ = 204509824752600. Its totient is φ = 199932565662720.

The previous prime is 202221010001191. The next prime is 202221010001239. The reversal of 202221010001221 is 122100010122202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 64354313028996 + 137866696972225 = 8022114^2 + 11741665^2 .

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 202221010001221 - 2³⁵ = 202186650262853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202221010001195 and 202221010001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221010008221) 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, 91505100 + ... + 93688981.

It is an arithmetic number, because the mean of its divisors is an integer number (25563728094075).

Almost surely, 2^{202221010001221} is an apocalyptic number.

It is an amenable number.

202221010001221 is a deficient number, since it is larger than the sum of its proper divisors (2288814751379).

202221010001221 is a wasteful number, since it uses less digits than its factorization.

202221010001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185206439.

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

Adding to 202221010001221 its reverse (122100010122202), we get a palindrome (324321020123423).

The spelling of 202221010001221 in words is "two hundred two trillion, two hundred twenty-one billion, ten million, one thousand, two hundred twenty-one".