2031221525 has 24 divisors (see below), whose sum is σ = 2603833344. Its totient is φ = 1570219200.

The previous prime is 2031221459. The next prime is 2031221561. The reversal of 2031221525 is 5251221302.

It is not a de Polignac number, because 2031221525 - 2²² = 2027027221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2031221525.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 667307 + ... + 670343.

It is an arithmetic number, because the mean of its divisors is an integer number (108493056).

Almost surely, 2^2031221525 is an apocalyptic number.

2031221525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2031221525 is a deficient number, since it is larger than the sum of its proper divisors (572611819).

2031221525 is a wasteful number, since it uses less digits than its factorization.

2031221525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 3936 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2031221525 is about 45069.0750404310. The cubic root of 2031221525 is about 1266.4433368575.

Adding to 2031221525 its reverse (5251221302), we get a palindrome (7282442827).

The spelling of 2031221525 in words is "two billion, thirty-one million, two hundred twenty-one thousand, five hundred twenty-five".