221402311444 has 6 divisors (see below), whose sum is σ = 387454045034. Its totient is φ = 110701155720.

The previous prime is 221402311421. The next prime is 221402311447. The reversal of 221402311444 is 444113204122.

It can be written as a sum of positive squares in only one way, i.e., 199442628100 + 21959683344 = 446590^2 + 148188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221402311447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27675288927 + ... + 27675288934.

Almost surely, 2^221402311444 is an apocalyptic number.

It is an amenable number.

221402311444 is a deficient number, since it is larger than the sum of its proper divisors (166051733590).

221402311444 is a wasteful number, since it uses less digits than its factorization.

221402311444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55350577865 (or 55350577863 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 221402311444 its reverse (444113204122), we get a palindrome (665515515566).

The spelling of 221402311444 in words is "two hundred twenty-one billion, four hundred two million, three hundred eleven thousand, four hundred forty-four".