201220423021 has 8 divisors (see below), whose sum is σ = 201841204320. Its totient is φ = 200600115408.

The previous prime is 201220423009. The next prime is 201220423069. The reversal of 201220423021 is 120324022102.

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 201220423021 - 2⁹ = 201220422509 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 201220423021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220421021) 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, 742095 + ... + 976291.

It is an arithmetic number, because the mean of its divisors is an integer number (25230150540).

Almost surely, 2^201220423021 is an apocalyptic number.

It is an amenable number.

201220423021 is a deficient number, since it is larger than the sum of its proper divisors (620781299).

201220423021 is a wasteful number, since it uses less digits than its factorization.

201220423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236843.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 201220423021 its reverse (120324022102), we get a palindrome (321544445123).

The spelling of 201220423021 in words is "two hundred one billion, two hundred twenty million, four hundred twenty-three thousand, twenty-one".