4221522020 has 12 divisors (see below), whose sum is σ = 8865196284. Its totient is φ = 1688608800.

The previous prime is 4221521977. The next prime is 4221522023. The reversal of 4221522020 is 202251224.

It can be written as a sum of positive squares in 2 ways, for example, as 2868459364 + 1353062656 = 53558^2 + 36784^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 211076101 = 4221522020 / (4 + 2 + 2 + 1 + 5 + 2 + 2 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 4221521983 and 4221522001.

It is not an unprimeable number, because it can be changed into a prime (4221522023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105538031 + ... + 105538070.

It is an arithmetic number, because the mean of its divisors is an integer number (738766357).

Almost surely, 2^4221522020 is an apocalyptic number.

It is an amenable number.

4221522020 is an abundant number, since it is smaller than the sum of its proper divisors (4643674264).

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

4221522020 is a wasteful number, since it uses less digits than its factorization.

4221522020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211076110 (or 211076108 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 4221522020 is about 64973.2407995784. The cubic root of 4221522020 is about 1616.1798443972.

Adding to 4221522020 its reverse (202251224), we get a palindrome (4423773244).

The spelling of 4221522020 in words is "four billion, two hundred twenty-one million, five hundred twenty-two thousand, twenty".