221221001232 has 200 divisors, whose sum is σ = 798268734912. Its totient is φ = 57459974400.

The previous prime is 221221001231. The next prime is 221221001249. The reversal of 221221001232 is 232100122122.

221221001232 is a `hidden beast` number, since 221 + 2 + 210 + 0 + 1 + 232 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221221001231) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1008619 + ... + 1208202.

Almost surely, 2^221221001232 is an apocalyptic number.

221221001232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221221001232 is an abundant number, since it is smaller than the sum of its proper divisors (577047733680).

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

221221001232 is a wasteful number, since it uses less digits than its factorization.

221221001232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216859 (or 2216844 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221221001232 its reverse (232100122122), we get a palindrome (453321123354).

The spelling of 221221001232 in words is "two hundred twenty-one billion, two hundred twenty-one million, one thousand, two hundred thirty-two".