221212100302 has 4 divisors (see below), whose sum is σ = 331818150456. Its totient is φ = 110606050150.

The previous prime is 221212100273. The next prime is 221212100303. The reversal of 221212100302 is 203001212122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212100303) 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 as a sum of consecutive naturals, namely, 55303025074 + ... + 55303025077.

It is an arithmetic number, because the mean of its divisors is an integer number (82954537614).

Almost surely, 2^221212100302 is an apocalyptic number.

221212100302 is a deficient number, since it is larger than the sum of its proper divisors (110606050154).

221212100302 is a wasteful number, since it uses less digits than its factorization.

221212100302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110606050153.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221212100302 its reverse (203001212122), we get a palindrome (424213312424).

The spelling of 221212100302 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred thousand, three hundred two".