221221101012 has 48 divisors (see below), whose sum is σ = 548413944960. Its totient is φ = 69273332352.

The previous prime is 221221100987. The next prime is 221221101029. The reversal of 221221101012 is 210101122122.

221221101012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221221100982 and 221221101000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8577568 + ... + 8603319.

It is an arithmetic number, because the mean of its divisors is an integer number (11425290520).

Almost surely, 2^221221101012 is an apocalyptic number.

It is an amenable number.

221221101012 is an abundant number, since it is smaller than the sum of its proper divisors (327192843948).

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

221221101012 is a wasteful number, since it uses less digits than its factorization.

221221101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17180960 (or 17180958 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221221101012 its reverse (210101122122), we get a palindrome (431322223134).

The spelling of 221221101012 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, twelve".