121220002000 has 40 divisors (see below), whose sum is σ = 293109969672. Its totient is φ = 48488000000.

The previous prime is 121220001983. The next prime is 121220002003. The reversal of 121220002000 is 200022121.

It can be written as a sum of positive squares in 4 ways, for example, as 4384558656 + 116835443344 = 66216^2 + 341812^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220002003) 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, 30303001 + ... + 30307000.

Almost surely, 2^121220002000 is an apocalyptic number.

121220002000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220002000 is an abundant number, since it is smaller than the sum of its proper divisors (171889967672).

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

121220002000 is an equidigital number, since it uses as much as digits as its factorization.

121220002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60610024 (or 60610008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 121220002000 its reverse (200022121), we get a palindrome (121420024121).

The spelling of 121220002000 in words is "one hundred twenty-one billion, two hundred twenty million, two thousand".