9812201111221 has 8 divisors (see below), whose sum is σ = 10271381810688. Its totient is φ = 9361936542000.

The previous prime is 9812201111213. The next prime is 9812201111291. The reversal of 9812201111221 is 1221111022189.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9812201111221 - 2³ = 9812201111213 is a prime.

It is a super-2 number, since 2×9812201111221² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9812201111291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2229030310 + ... + 2229034711.

It is an arithmetic number, because the mean of its divisors is an integer number (1283922726336).

Almost surely, 2^{9812201111221} is an apocalyptic number.

It is an amenable number.

9812201111221 is a deficient number, since it is larger than the sum of its proper divisors (459180699467).

9812201111221 is a wasteful number, since it uses less digits than its factorization.

9812201111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458065123.

The product of its (nonzero) digits is 1152, while the sum is 31.

The spelling of 9812201111221 in words is "nine trillion, eight hundred twelve billion, two hundred one million, one hundred eleven thousand, two hundred twenty-one".