221312310102 has 80 divisors (see below), whose sum is σ = 547075755072. Its totient is φ = 66435189120.

The previous prime is 221312310071. The next prime is 221312310103. The reversal of 221312310102 is 201013213122.

221312310102 is a `hidden beast` number, since 221 + 31 + 2 + 310 + 102 = 666.

It is a super-2 number, since 2×221312310102² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312310103) 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 in 39 ways as a sum of consecutive naturals, for example, 1195198 + ... + 1367889.

Almost surely, 2^221312310102 is an apocalyptic number.

221312310102 is an abundant number, since it is smaller than the sum of its proper divisors (325763444970).

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

221312310102 is a wasteful number, since it uses less digits than its factorization.

221312310102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563155 (or 2563146 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221312310102 its reverse (201013213122), we get a palindrome (422325523224).

The spelling of 221312310102 in words is "two hundred twenty-one billion, three hundred twelve million, three hundred ten thousand, one hundred two".