221201211012 has 24 divisors (see below), whose sum is σ = 524884231200. Its totient is φ = 72484012416.

The previous prime is 221201210969. The next prime is 221201211059. The reversal of 221201211012 is 210112102122.

It is a junction number, because it is equal to n+sod(n) for n = 221201210982 and 221201211000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156214837 + ... + 156216252.

It is an arithmetic number, because the mean of its divisors is an integer number (21870176300).

Almost surely, 2^221201211012 is an apocalyptic number.

It is an amenable number.

221201211012 is an abundant number, since it is smaller than the sum of its proper divisors (303683020188).

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

221201211012 is a wasteful number, since it uses less digits than its factorization.

221201211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312431155 (or 312431153 counting only the distinct ones).

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

Adding to 221201211012 its reverse (210112102122), we get a palindrome (431313313134).

The spelling of 221201211012 in words is "two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, twelve".