221220022020 has 96 divisors (see below), whose sum is σ = 621990690048. Its totient is φ = 58747110912.

The previous prime is 221220022019. The next prime is 221220022027. The reversal of 221220022020 is 20220022122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (221220022027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28774617 + ... + 28782303.

It is an arithmetic number, because the mean of its divisors is an integer number (6479069688).

Almost surely, 2^221220022020 is an apocalyptic number.

221220022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220022020 is an abundant number, since it is smaller than the sum of its proper divisors (400770668028).

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

221220022020 is a wasteful number, since it uses less digits than its factorization.

221220022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9629 (or 9627 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 221220022020 its reverse (20220022122), we get a palindrome (241440044142).

The spelling of 221220022020 in words is "two hundred twenty-one billion, two hundred twenty million, twenty-two thousand, twenty".