221220021201 has 4 divisors (see below), whose sum is σ = 294960028272. Its totient is φ = 147480014132.

The previous prime is 221220021179. The next prime is 221220021229. The reversal of 221220021201 is 102120022122.

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 221220021201 - 2⁹ = 221220020689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221220021271) 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, 36870003531 + ... + 36870003536.

It is an arithmetic number, because the mean of its divisors is an integer number (73740007068).

Almost surely, 2^221220021201 is an apocalyptic number.

It is an amenable number.

221220021201 is a deficient number, since it is larger than the sum of its proper divisors (73740007071).

221220021201 is an equidigital number, since it uses as much as digits as its factorization.

221220021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73740007070.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221220021201 its reverse (102120022122), we get a palindrome (323340043323).

The spelling of 221220021201 in words is "two hundred twenty-one billion, two hundred twenty million, twenty-one thousand, two hundred one".