231121000 has 64 divisors (see below), whose sum is σ = 590016960. Its totient is φ = 84040000.

The previous prime is 231120983. The next prime is 231121013. The reversal of 231121000 is 121132.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495 + ... + 21505.

It is an arithmetic number, because the mean of its divisors is an integer number (9219015).

Almost surely, 2^231121000 is an apocalyptic number.

231121000 is a gapful number since it is divisible by the number (20) 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 231121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295008480).

231121000 is an abundant number, since it is smaller than the sum of its proper divisors (358895960).

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

231121000 is a wasteful number, since it uses less digits than its factorization.

231121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21043 (or 21029 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 231121000 is about 15202.6642401916. The cubic root of 231121000 is about 613.6863581498.

Adding to 231121000 its reverse (121132), we get a palindrome (231242132).

The spelling of 231121000 in words is "two hundred thirty-one million, one hundred twenty-one thousand".