221132145621 has 8 divisors (see below), whose sum is σ = 294845248800. Its totient is φ = 147420236432.

The previous prime is 221132145613. The next prime is 221132145631. The reversal of 221132145621 is 126541231122.

221132145621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221132145621 - 2³ = 221132145613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221132145631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312055 + ... + 734603.

It is an arithmetic number, because the mean of its divisors is an integer number (36855656100).

Almost surely, 2^221132145621 is an apocalyptic number.

It is an amenable number.

221132145621 is a deficient number, since it is larger than the sum of its proper divisors (73713103179).

221132145621 is a wasteful number, since it uses less digits than its factorization.

221132145621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596995.

The product of its digits is 5760, while the sum is 30.

Adding to 221132145621 its reverse (126541231122), we get a palindrome (347673376743).

The spelling of 221132145621 in words is "two hundred twenty-one billion, one hundred thirty-two million, one hundred forty-five thousand, six hundred twenty-one".