223121142 has 96 divisors (see below), whose sum is σ = 536565120. Its totient is φ = 69284160.

The previous prime is 223121117. The next prime is 223121177. The reversal of 223121142 is 241121322.

It is a happy number.

It is a super-3 number, since 3×223121142³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 673917 + ... + 674247.

It is an arithmetic number, because the mean of its divisors is an integer number (5589220).

Almost surely, 2^223121142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 223121142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268282560).

223121142 is an abundant number, since it is smaller than the sum of its proper divisors (313443978).

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

223121142 is a wasteful number, since it uses less digits than its factorization.

223121142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 428 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 223121142 is about 14937.2401065257. The cubic root of 223121142 is about 606.5224883129.

Adding to 223121142 its reverse (241121322), we get a palindrome (464242464).

The spelling of 223121142 in words is "two hundred twenty-three million, one hundred twenty-one thousand, one hundred forty-two".