221201001012 has 96 divisors (see below), whose sum is σ = 547624000000. Its totient is φ = 69297876864.

The previous prime is 221201000989. The next prime is 221201001089. The reversal of 221201001012 is 210100102122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 80464614 + ... + 80467362.

Almost surely, 2^221201001012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221201001012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273812000000).

221201001012 is an abundant number, since it is smaller than the sum of its proper divisors (326422998988).

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

221201001012 is a wasteful number, since it uses less digits than its factorization.

221201001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5453 (or 5451 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221201001012 its reverse (210100102122), we get a palindrome (431301103134).

The spelling of 221201001012 in words is "two hundred twenty-one billion, two hundred one million, one thousand, twelve".