1321231000 has 64 divisors (see below), whose sum is σ = 3099170880. Its totient is φ = 527212800.

The previous prime is 1321230979. The next prime is 1321231003. The reversal of 1321231000 is 1321231.

It is a super-2 number, since 2×1321231000² = 3491302710722000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321231003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485644 + ... + 488356.

It is an arithmetic number, because the mean of its divisors is an integer number (48424545).

Almost surely, 2^1321231000 is an apocalyptic number.

1321231000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1549585440).

1321231000 is an abundant number, since it is smaller than the sum of its proper divisors (1777939880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321231000 is a wasteful number, since it uses less digits than its factorization.

1321231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221 (or 3207 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1321231000 is about 36348.7413812363. The cubic root of 1321231000 is about 1097.3022043804.

Adding to 1321231000 its reverse (1321231), we get a palindrome (1322552231).

1321231000 divided by its reverse (1321231) gives a cube (1000 = 10³).

The spelling of 1321231000 in words is "one billion, three hundred twenty-one million, two hundred thirty-one thousand".