200101001221 has 4 divisors (see below), whose sum is σ = 218292001344. Its totient is φ = 181910001100.

The previous prime is 200101001207. The next prime is 200101001281. The reversal of 200101001221 is 122100101002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 200101001221 - 2¹⁵ = 200100968453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200101001198 and 200101001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200101001281) 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, 9095500045 + ... + 9095500066.

It is an arithmetic number, because the mean of its divisors is an integer number (54573000336).

Almost surely, 2^200101001221 is an apocalyptic number.

It is an amenable number.

200101001221 is a deficient number, since it is larger than the sum of its proper divisors (18191000123).

200101001221 is a wasteful number, since it uses less digits than its factorization.

200101001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18191000122.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 200101001221 its reverse (122100101002), we get a palindrome (322201102223).

The spelling of 200101001221 in words is "two hundred billion, one hundred one million, one thousand, two hundred twenty-one".