1221000323202 has 144 divisors (see below), whose sum is σ = 3036985346304. Its totient is φ = 353599171200.

The previous prime is 1221000323197. The next prime is 1221000323203. The reversal of 1221000323202 is 2023230001221.

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

It is not an unprimeable number, because it can be changed into a prime (1221000323203) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 59751927 + ... + 59772357.

It is an arithmetic number, because the mean of its divisors is an integer number (21090176016).

Almost surely, 2^{1221000323202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221000323202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518492673152).

1221000323202 is an abundant number, since it is smaller than the sum of its proper divisors (1815985023102).

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

1221000323202 is a wasteful number, since it uses less digits than its factorization.

1221000323202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21677 (or 21663 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 1221000323202 its reverse (2023230001221), we get a palindrome (3244230324423).

The spelling of 1221000323202 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three thousand, two hundred two".