2220901521 has 4 divisors (see below), whose sum is σ = 2961202032. Its totient is φ = 1480601012.

The previous prime is 2220901517. The next prime is 2220901537. The reversal of 2220901521 is 1251090222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2220901521 - 2² = 2220901517 is a prime.

It is a super-2 number, since 2×2220901521² = 9864807131960226882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2220901491 and 2220901500.

It is not an unprimeable number, because it can be changed into a prime (2220901561) 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, 370150251 + ... + 370150256.

It is an arithmetic number, because the mean of its divisors is an integer number (740300508).

Almost surely, 2^2220901521 is an apocalyptic number.

It is an amenable number.

2220901521 is a deficient number, since it is larger than the sum of its proper divisors (740300511).

2220901521 is an equidigital number, since it uses as much as digits as its factorization.

2220901521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740300510.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 2220901521 is about 47126.4418453165. The cubic root of 2220901521 is about 1304.6973106349.

Adding to 2220901521 its reverse (1251090222), we get a palindrome (3471991743).

The spelling of 2220901521 in words is "two billion, two hundred twenty million, nine hundred one thousand, five hundred twenty-one".