201220254001 has 4 divisors (see below), whose sum is σ = 216698735092. Its totient is φ = 185741772912.

The previous prime is 201220253989. The next prime is 201220254041. The reversal of 201220254001 is 100452022102.

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 51961658401 + 149258595600 = 227951^2 + 386340^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220254001 - 2⁷ = 201220253873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201220254001.

It is not an unprimeable number, because it can be changed into a prime (201220254041) 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, 7739240526 + ... + 7739240551.

It is an arithmetic number, because the mean of its divisors is an integer number (54174683773).

Almost surely, 2^201220254001 is an apocalyptic number.

It is an amenable number.

201220254001 is a deficient number, since it is larger than the sum of its proper divisors (15478481091).

201220254001 is a wasteful number, since it uses less digits than its factorization.

201220254001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15478481090.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 201220254001 its reverse (100452022102), we get a palindrome (301672276103).

The spelling of 201220254001 in words is "two hundred one billion, two hundred twenty million, two hundred fifty-four thousand, one".