221001321012 has 48 divisors (see below), whose sum is σ = 531050231040. Its totient is φ = 71480748672.

The previous prime is 221001321011. The next prime is 221001321029. The reversal of 221001321012 is 210123100122.

It is a junction number, because it is equal to n+sod(n) for n = 221001320982 and 221001321000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001321011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515187 + ... + 841082.

It is an arithmetic number, because the mean of its divisors is an integer number (11063546480).

Almost surely, 2^221001321012 is an apocalyptic number.

It is an amenable number.

221001321012 is an abundant number, since it is smaller than the sum of its proper divisors (310048910028).

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

221001321012 is a wasteful number, since it uses less digits than its factorization.

221001321012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356680 (or 1356678 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221001321012 its reverse (210123100122), we get a palindrome (431124421134).

The spelling of 221001321012 in words is "two hundred twenty-one billion, one million, three hundred twenty-one thousand, twelve".