2122557900 has 72 divisors (see below), whose sum is σ = 6150637584. Its totient is φ = 565152000.

The previous prime is 2122557803. The next prime is 2122557901. The reversal of 2122557900 is 97552212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2122557901) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 205254 + ... + 215346.

It is an arithmetic number, because the mean of its divisors is an integer number (85425522).

Almost surely, 2^2122557900 is an apocalyptic number.

2122557900 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 2122557900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3075318792).

2122557900 is an abundant number, since it is smaller than the sum of its proper divisors (4028079684).

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

2122557900 is a wasteful number, since it uses less digits than its factorization.

2122557900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10811 (or 10804 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 2122557900 is about 46071.2263782939. The cubic root of 2122557900 is about 1285.1481103284.

The spelling of 2122557900 in words is "two billion, one hundred twenty-two million, five hundred fifty-seven thousand, nine hundred".