1221023331 has 48 divisors (see below), whose sum is σ = 1969868160. Its totient is φ = 722597760.

The previous prime is 1221023327. The next prime is 1221023357. The reversal of 1221023331 is 1333201221.

It is not a de Polignac number, because 1221023331 - 2² = 1221023327 is a prime.

It is a super-2 number, since 2×1221023331² = 2981795949692671122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221023831) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 772500 + ... + 774078.

It is an arithmetic number, because the mean of its divisors is an integer number (41038920).

Almost surely, 2^1221023331 is an apocalyptic number.

1221023331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221023331 is a deficient number, since it is larger than the sum of its proper divisors (748844829).

1221023331 is a wasteful number, since it uses less digits than its factorization.

1221023331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776 (or 1773 counting only the distinct ones).

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

The square root of 1221023331 is about 34943.1442632171. The cubic root of 1221023331 is about 1068.8284061079.

Adding to 1221023331 its reverse (1333201221), we get a palindrome (2554224552).

The spelling of 1221023331 in words is "one billion, two hundred twenty-one million, twenty-three thousand, three hundred thirty-one".