2215204400 has 30 divisors (see below), whose sum is σ = 5322029532. Its totient is φ = 886081600.

The previous prime is 2215204391. The next prime is 2215204403. The reversal of 2215204400 is 44025122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (2215204403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2768606 + ... + 2769405.

Almost surely, 2^2215204400 is an apocalyptic number.

2215204400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2215204400 is an abundant number, since it is smaller than the sum of its proper divisors (3106825132).

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

2215204400 is a wasteful number, since it uses less digits than its factorization.

2215204400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538029 (or 5538018 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2215204400 is about 47065.9579738902. The cubic root of 2215204400 is about 1303.5807395416.

Adding to 2215204400 its reverse (44025122), we get a palindrome (2259229522).

The spelling of 2215204400 in words is "two billion, two hundred fifteen million, two hundred four thousand, four hundred".