221400203344 has 10 divisors (see below), whose sum is σ = 428962894010. Its totient is φ = 110700101664.

The previous prime is 221400203329. The next prime is 221400203347. The reversal of 221400203344 is 443302004122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 178749692944 + 42650510400 = 422788^2 + 206520^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221400203347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6918756339 + ... + 6918756370.

It is an arithmetic number, because the mean of its divisors is an integer number (42896289401).

Almost surely, 2^221400203344 is an apocalyptic number.

It is an amenable number.

221400203344 is a deficient number, since it is larger than the sum of its proper divisors (207562690666).

221400203344 is a wasteful number, since it uses less digits than its factorization.

221400203344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13837512717 (or 13837512711 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 221400203344 its reverse (443302004122), we get a palindrome (664702207466).

The spelling of 221400203344 in words is "two hundred twenty-one billion, four hundred million, two hundred three thousand, three hundred forty-four".