1222212321000 has 320 divisors, whose sum is σ = 4660706381760. Its totient is φ = 296293680000.

The previous prime is 1222212320933. The next prime is 1222212321061. The reversal of 1222212321000 is 1232122221.

1222212321000 is a `hidden beast` number, since 122 + 221 + 2 + 321 + 0 + 0 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 205135 + ... + 1576865.

It is an arithmetic number, because the mean of its divisors is an integer number (14564707443).

Almost surely, 2^{1222212321000} is an apocalyptic number.

1222212321000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222212321000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2330353190880).

1222212321000 is an abundant number, since it is smaller than the sum of its proper divisors (3438494060760).

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

1222212321000 is a wasteful number, since it uses less digits than its factorization.

1222212321000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371775 (or 1371752 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1222212321000 its reverse (1232122221), we get a palindrome (1223444443221).

The spelling of 1222212321000 in words is "one trillion, two hundred twenty-two billion, two hundred twelve million, three hundred twenty-one thousand".