201221121232 has 20 divisors (see below), whose sum is σ = 410385182080. Its totient is φ = 95315267808.

The previous prime is 201221121221. The next prime is 201221121247. The reversal of 201221121232 is 232121122102.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330955488 + ... + 330956095.

It is an arithmetic number, because the mean of its divisors is an integer number (20519259104).

Almost surely, 2^201221121232 is an apocalyptic number.

It is an amenable number.

201221121232 is an abundant number, since it is smaller than the sum of its proper divisors (209164060848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201221121232 is a wasteful number, since it uses less digits than its factorization.

201221121232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661911610 (or 661911604 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 201221121232 its reverse (232121122102), we get a palindrome (433342243334).

The spelling of 201221121232 in words is "two hundred one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-two".