221000302312 has 8 divisors (see below), whose sum is σ = 414375566850. Its totient is φ = 110500151152.

The previous prime is 221000302267. The next prime is 221000302319. The reversal of 221000302312 is 213203000122.

221000302312 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 207868517476 + 13131784836 = 455926^2 + 114594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×221000302312² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221000302319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13812518887 + ... + 13812518902.

Almost surely, 2^221000302312 is an apocalyptic number.

It is an amenable number.

221000302312 is a deficient number, since it is larger than the sum of its proper divisors (193375264538).

221000302312 is a wasteful number, since it uses less digits than its factorization.

221000302312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27625037795 (or 27625037791 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 221000302312 its reverse (213203000122), we get a palindrome (434203302434).

The spelling of 221000302312 in words is "two hundred twenty-one billion, three hundred two thousand, three hundred twelve".