201242443221 has 32 divisors (see below), whose sum is σ = 302882611200. Its totient is φ = 132037017840.

The previous prime is 201242443169. The next prime is 201242443229. The reversal of 201242443221 is 122344242102.

It is a happy number.

201242443221 is a `hidden beast` number, since 2 + 0 + 12 + 424 + 4 + 3 + 221 = 666.

It is not a de Polignac number, because 201242443221 - 2³¹ = 199094959573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201242443229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 511680 + ... + 815046.

It is an arithmetic number, because the mean of its divisors is an integer number (9465081600).

Almost surely, 2^201242443221 is an apocalyptic number.

It is an amenable number.

201242443221 is a deficient number, since it is larger than the sum of its proper divisors (101640167979).

201242443221 is a wasteful number, since it uses less digits than its factorization.

201242443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303766 (or 303760 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 201242443221 its reverse (122344242102), we get a palindrome (323586685323).

The spelling of 201242443221 in words is "two hundred one billion, two hundred forty-two million, four hundred forty-three thousand, two hundred twenty-one".