121221222122000 has 720 divisors, whose sum is σ = 398711335591296. Its totient is φ = 34876752768000.

The previous prime is 121221222121931. The next prime is 121221222122029. The reversal of 121221222122000 is 221222122121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 286074287 + ... + 286497713.

Almost surely, 2^{121221222122000} is an apocalyptic number.

121221222122000 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 121221222122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199355667795648).

121221222122000 is an abundant number, since it is smaller than the sum of its proper divisors (277490113469296).

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

121221222122000 is a wasteful number, since it uses less digits than its factorization.

121221222122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423505 (or 423465 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121221222122000 its reverse (221222122121), we get a palindrome (121442444244121).

The spelling of 121221222122000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand".