2121221000 has 64 divisors (see below), whose sum is σ = 5179524480. Its totient is φ = 811588800.

The previous prime is 2121220991. The next prime is 2121221017. The reversal of 2121221000 is 1221212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23114 + ... + 69113.

It is an arithmetic number, because the mean of its divisors is an integer number (80930070).

Almost surely, 2^2121221000 is an apocalyptic number.

2121221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121221000 is an abundant number, since it is smaller than the sum of its proper divisors (3058303480).

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

2121221000 is a wasteful number, since it uses less digits than its factorization.

2121221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92271 (or 92257 counting only the distinct ones).

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

The square root of 2121221000 is about 46056.7150370063. The cubic root of 2121221000 is about 1284.8782354202.

Adding to 2121221000 its reverse (1221212), we get a palindrome (2122442212).

The spelling of 2121221000 in words is "two billion, one hundred twenty-one million, two hundred twenty-one thousand".