1221032331 has 12 divisors (see below), whose sum is σ = 1764097608. Its totient is φ = 813844224.

The previous prime is 1221032311. The next prime is 1221032353. The reversal of 1221032331 is 1332301221.

1221032331 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1221032331 - 2⁵ = 1221032299 is a prime.

It is a super-2 number, since 2×1221032331² = 2981839906694587122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221032311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39211 + ... + 63083.

It is an arithmetic number, because the mean of its divisors is an integer number (147008134).

Almost surely, 2^1221032331 is an apocalyptic number.

1221032331 is a deficient number, since it is larger than the sum of its proper divisors (543065277).

1221032331 is a wasteful number, since it uses less digits than its factorization.

1221032331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29562 (or 29559 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1221032331 is about 34943.2730436060. The cubic root of 1221032331 is about 1068.8310321652.

Adding to 1221032331 its reverse (1332301221), we get a palindrome (2553333552).

The spelling of 1221032331 in words is "one billion, two hundred twenty-one million, thirty-two thousand, three hundred thirty-one".