2231521015 has 4 divisors (see below), whose sum is σ = 2677825224. Its totient is φ = 1785216808.

The previous prime is 2231520989. The next prime is 2231521043. The reversal of 2231521015 is 5101251322.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2231521015 - 2⁷ = 2231520887 is a prime.

It is a super-3 number, since 3×2231521015³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223152097 + ... + 223152106.

It is an arithmetic number, because the mean of its divisors is an integer number (669456306).

Almost surely, 2^2231521015 is an apocalyptic number.

2231521015 is a deficient number, since it is larger than the sum of its proper divisors (446304209).

2231521015 is an equidigital number, since it uses as much as digits as its factorization.

2231521015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446304208.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 2231521015 is about 47238.9777090910. The cubic root of 2231521015 is about 1306.7735246051.

Adding to 2231521015 its reverse (5101251322), we get a palindrome (7332772337).

The spelling of 2231521015 in words is "two billion, two hundred thirty-one million, five hundred twenty-one thousand, fifteen".