2212122400 has 72 divisors (see below), whose sum is σ = 5491992240. Its totient is φ = 869832960.

The previous prime is 2212122373. The next prime is 2212122403. The reversal of 2212122400 is 42212122.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (2212122403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23767 + ... + 70633.

It is an arithmetic number, because the mean of its divisors is an integer number (76277670).

Almost surely, 2^2212122400 is an apocalyptic number.

2212122400 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 2212122400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2745996120).

2212122400 is an abundant number, since it is smaller than the sum of its proper divisors (3279869840).

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

2212122400 is a wasteful number, since it uses less digits than its factorization.

2212122400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46946 (or 46933 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2212122400 is about 47033.2052915810. The cubic root of 2212122400 is about 1302.9759043823.

Adding to 2212122400 its reverse (42212122), we get a palindrome (2254334522).

It can be divided in two parts, 22121 and 22400, that added together give a square (44521 = 211²).

The spelling of 2212122400 in words is "two billion, two hundred twelve million, one hundred twenty-two thousand, four hundred".