221221402332020 has 24 divisors (see below), whose sum is σ = 464569768034568. Its totient is φ = 88487642240000.

The previous prime is 221221402332019. The next prime is 221221402332059. The reversal of 221221402332020 is 20233204122122.

221221402332020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12908585493904 + 208312816838116 = 3592852^2 + 14433046^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55442081 + ... + 59298120.

It is an arithmetic number, because the mean of its divisors is an integer number (19357073668107).

Almost surely, 2^{221221402332020} is an apocalyptic number.

221221402332020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221402332020 is an abundant number, since it is smaller than the sum of its proper divisors (243348365702548).

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

221221402332020 is a wasteful number, since it uses less digits than its factorization.

221221402332020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114836611 (or 114836609 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 221221402332020 its reverse (20233204122122), we get a palindrome (241454606454142).

The spelling of 221221402332020 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, four hundred two million, three hundred thirty-two thousand, twenty".