221221202144 has 48 divisors (see below), whose sum is σ = 437639594112. Its totient is φ = 110075002368.

The previous prime is 221221202143. The next prime is 221221202149. The reversal of 221221202144 is 441202122122.

It is a super-3 number, since 3×221221202144³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221202143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38053382 + ... + 38059194.

It is an arithmetic number, because the mean of its divisors is an integer number (9117491544).

Almost surely, 2^221221202144 is an apocalyptic number.

It is an amenable number.

221221202144 is a deficient number, since it is larger than the sum of its proper divisors (216418391968).

221221202144 is a wasteful number, since it uses less digits than its factorization.

221221202144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11379 (or 11371 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221221202144 its reverse (441202122122), we get a palindrome (662423324266).

The spelling of 221221202144 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred forty-four".