2221320525 has 24 divisors (see below), whose sum is σ = 3680505504. Its totient is φ = 1182148800.

The previous prime is 2221320449. The next prime is 2221320529. The reversal of 2221320525 is 5250231222.

It is not a de Polignac number, because 2221320525 - 2²² = 2217126221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221320495 and 2221320504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221320529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3315 + ... + 66735.

It is an arithmetic number, because the mean of its divisors is an integer number (153354396).

Almost surely, 2^2221320525 is an apocalyptic number.

2221320525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2221320525 is a deficient number, since it is larger than the sum of its proper divisors (1459184979).

2221320525 is a wasteful number, since it uses less digits than its factorization.

2221320525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63901 (or 63896 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 2221320525 is about 47130.8871654248. The cubic root of 2221320525 is about 1304.7793552478.

Adding to 2221320525 its reverse (5250231222), we get a palindrome (7471551747).

The spelling of 2221320525 in words is "two billion, two hundred twenty-one million, three hundred twenty thousand, five hundred twenty-five".