221213100012 has 24 divisors (see below), whose sum is σ = 532814349312. Its totient is φ = 71359064400.

The previous prime is 221213100011. The next prime is 221213100023. The reversal of 221213100012 is 210001312122.

It is a super-2 number, since 2×221213100012² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221213099964 and 221213100000.

It is not an unprimeable number, because it can be changed into a prime (221213100011) by changing a digit.

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, 297329064 + ... + 297329807.

It is an arithmetic number, because the mean of its divisors is an integer number (22200597888).

Almost surely, 2^221213100012 is an apocalyptic number.

It is an amenable number.

221213100012 is an abundant number, since it is smaller than the sum of its proper divisors (311601249300).

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

221213100012 is a wasteful number, since it uses less digits than its factorization.

221213100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594658909 (or 594658907 counting only the distinct ones).

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

Adding to 221213100012 its reverse (210001312122), we get a palindrome (431214412134).

The spelling of 221213100012 in words is "two hundred twenty-one billion, two hundred thirteen million, one hundred thousand, twelve".