2212121000 has 64 divisors (see below), whose sum is σ = 5189184000. Its totient is φ = 882657600.

The previous prime is 2212120969. The next prime is 2212121029. The reversal of 2212121000 is 1212122.

It is a happy number.

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, 436481 + ... + 441519.

It is an arithmetic number, because the mean of its divisors is an integer number (81081000).

Almost surely, 2^2212121000 is an apocalyptic number.

2212121000 is a gapful number since it is divisible by the number (20) 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 2212121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594592000).

2212121000 is an abundant number, since it is smaller than the sum of its proper divisors (2977063000).

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

2212121000 is a wasteful number, since it uses less digits than its factorization.

2212121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499 (or 5485 counting only the distinct ones).

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

The square root of 2212121000 is about 47033.1904084764. The cubic root of 2212121000 is about 1302.9756295081.

Adding to 2212121000 its reverse (1212122), we get a palindrome (2213333122).

The spelling of 2212121000 in words is "two billion, two hundred twelve million, one hundred twenty-one thousand".