221200311400 has 24 divisors (see below), whose sum is σ = 514290724470. Its totient is φ = 88480124480.

The previous prime is 221200311383. The next prime is 221200311401. The reversal of 221200311400 is 4113002122.

It can be written as a sum of positive squares in 3 ways, for example, as 193049511876 + 28150799524 = 439374^2 + 167782^2 .

It is not an unprimeable number, because it can be changed into a prime (221200311401) 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, 553000579 + ... + 553000978.

Almost surely, 2^221200311400 is an apocalyptic number.

221200311400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200311400 is an abundant number, since it is smaller than the sum of its proper divisors (293090413070).

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

221200311400 is a wasteful number, since it uses less digits than its factorization.

221200311400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106001573 (or 1106001564 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221200311400 its reverse (4113002122), we get a palindrome (225313313522).

The spelling of 221200311400 in words is "two hundred twenty-one billion, two hundred million, three hundred eleven thousand, four hundred".