221015422020 has 96 divisors (see below), whose sum is σ = 623317161600. Its totient is φ = 58511764480.

The previous prime is 221015422013. The next prime is 221015422049. The reversal of 221015422020 is 20224510122.

221015422020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 21388255 + ... + 21398585.

It is an arithmetic number, because the mean of its divisors is an integer number (6492887100).

Almost surely, 2^221015422020 is an apocalyptic number.

221015422020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221015422020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311658580800).

221015422020 is an abundant number, since it is smaller than the sum of its proper divisors (402301739580).

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

221015422020 is a wasteful number, since it uses less digits than its factorization.

221015422020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12885 (or 12883 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 221015422020 its reverse (20224510122), we get a palindrome (241239932142).

The spelling of 221015422020 in words is "two hundred twenty-one billion, fifteen million, four hundred twenty-two thousand, twenty".