222020521 has 4 divisors (see below), whose sum is σ = 225061972. Its totient is φ = 218979072.

The previous prime is 222020509. The next prime is 222020531. The reversal of 222020521 is 125020222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125020222 = 2 ⋅62510111.

It can be written as a sum of positive squares in 2 ways, for example, as 163712025 + 58308496 = 12795^2 + 7636^2 .

It is a cyclic number.

It is not a de Polignac number, because 222020521 - 2²¹ = 219923369 is a prime.

It is a super-2 number, since 2×222020521² = 98586223490222882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222020495 and 222020504.

It is not an unprimeable number, because it can be changed into a prime (222020531) 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, 1520616 + ... + 1520761.

It is an arithmetic number, because the mean of its divisors is an integer number (56265493).

Almost surely, 2^222020521 is an apocalyptic number.

It is an amenable number.

222020521 is a deficient number, since it is larger than the sum of its proper divisors (3041451).

222020521 is an equidigital number, since it uses as much as digits as its factorization.

222020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041450.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 222020521 is about 14900.3530495086. The cubic root of 222020521 is about 605.5235510822.

Adding to 222020521 its reverse (125020222), we get a palindrome (347040743).

The spelling of 222020521 in words is "two hundred twenty-two million, twenty thousand, five hundred twenty-one".