201220213001 has 4 divisors (see below), whose sum is σ = 201221178900. Its totient is φ = 201219247104.

The previous prime is 201220212983. The next prime is 201220213027. The reversal of 201220213001 is 100312022102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 100312022102 = 2 ⋅50156011051.

It can be written as a sum of positive squares in 2 ways, for example, as 125529198601 + 75691014400 = 354301^2 + 275120^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220213001 - 2¹⁰ = 201220211977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201220513001) 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, 26936 + ... + 634953.

It is an arithmetic number, because the mean of its divisors is an integer number (50305294725).

Almost surely, 2^201220213001 is an apocalyptic number.

It is an amenable number.

201220213001 is a deficient number, since it is larger than the sum of its proper divisors (965899).

201220213001 is an equidigital number, since it uses as much as digits as its factorization.

201220213001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965898.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 201220213001 its reverse (100312022102), we get a palindrome (301532235103).

The spelling of 201220213001 in words is "two hundred one billion, two hundred twenty million, two hundred thirteen thousand, one".