221012122102 has 4 divisors (see below), whose sum is σ = 331518183156. Its totient is φ = 110506061050.

The previous prime is 221012122091. The next prime is 221012122103. The reversal of 221012122102 is 201221210122.

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 (221012122103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55253030524 + ... + 55253030527.

It is an arithmetic number, because the mean of its divisors is an integer number (82879545789).

Almost surely, 2^221012122102 is an apocalyptic number.

221012122102 is a deficient number, since it is larger than the sum of its proper divisors (110506061054).

221012122102 is a wasteful number, since it uses less digits than its factorization.

221012122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110506061053.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221012122102 its reverse (201221210122), we get a palindrome (422233332224).

The spelling of 221012122102 in words is "two hundred twenty-one billion, twelve million, one hundred twenty-two thousand, one hundred two".