221012101212 has 96 divisors (see below), whose sum is σ = 625803397632. Its totient is φ = 59263328256.

The previous prime is 221012101187. The next prime is 221012101217. The reversal of 221012101212 is 212101210122.

It is a junction number, because it is equal to n+sod(n) for n = 221012101191 and 221012101200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012101217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284863 + ... + 723305.

It is an arithmetic number, because the mean of its divisors is an integer number (6518785392).

Almost surely, 2^221012101212 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 221012101212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312901698816).

221012101212 is an abundant number, since it is smaller than the sum of its proper divisors (404791296420).

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

221012101212 is a wasteful number, since it uses less digits than its factorization.

221012101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438827 (or 438825 counting only the distinct ones).

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

Adding to 221012101212 its reverse (212101210122), we get a palindrome (433113311334).

The spelling of 221012101212 in words is "two hundred twenty-one billion, twelve million, one hundred one thousand, two hundred twelve".