1222120001000 has 64 divisors (see below), whose sum is σ = 2958373314000. Its totient is φ = 471991161600.

The previous prime is 1222120000999. The next prime is 1222120001051. The reversal of 1222120001000 is 1000212221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 40503172516 + 1181616828484 = 201254^2 + 1087022^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21042035 + ... + 21100034.

Almost surely, 2^{1222120001000} is an apocalyptic number.

1222120001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222120001000 is an abundant number, since it is smaller than the sum of its proper divisors (1736253313000).

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

1222120001000 is a wasteful number, since it uses less digits than its factorization.

1222120001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42142119 (or 42142105 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1222120001000 its reverse (1000212221), we get a palindrome (1223120213221).

The spelling of 1222120001000 in words is "one trillion, two hundred twenty-two billion, one hundred twenty million, one thousand".