221011231000 has 128 divisors (see below), whose sum is σ = 591386664960. Its totient is φ = 75731760000.

The previous prime is 221011230983. The next prime is 221011231009. The reversal of 221011231000 is 132110122.

It is a super-2 number, since 2×221011231000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011231009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13648909 + ... + 13665091.

It is an arithmetic number, because the mean of its divisors is an integer number (4620208320).

Almost surely, 2^221011231000 is an apocalyptic number.

221011231000 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 221011231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295693332480).

221011231000 is an abundant number, since it is smaller than the sum of its proper divisors (370375433960).

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

221011231000 is a wasteful number, since it uses less digits than its factorization.

221011231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18162 (or 18148 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 221011231000 its reverse (132110122), we get a palindrome (221143341122).

The spelling of 221011231000 in words is "two hundred twenty-one billion, eleven million, two hundred thirty-one thousand".