221142123 has 8 divisors (see below), whose sum is σ = 327618000. Its totient is φ = 147428064.

The previous prime is 221142073. The next prime is 221142169. The reversal of 221142123 is 321241122.

It is a happy number.

221142123 is a `hidden beast` number, since 221 + 1 + 421 + 23 = 666.

It is not a de Polignac number, because 221142123 - 2¹³ = 221133931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221142096 and 221142105.

It is not an unprimeable number, because it can be changed into a prime (221147123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4095198 + ... + 4095251.

It is an arithmetic number, because the mean of its divisors is an integer number (40952250).

Almost surely, 2^221142123 is an apocalyptic number.

221142123 is a deficient number, since it is larger than the sum of its proper divisors (106475877).

221142123 is an equidigital number, since it uses as much as digits as its factorization.

221142123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8190458 (or 8190452 counting only the distinct ones).

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

The square root of 221142123 is about 14870.8480928291. The cubic root of 221142123 is about 604.7239347916.

Adding to 221142123 its reverse (321241122), we get a palindrome (542383245).

The spelling of 221142123 in words is "two hundred twenty-one million, one hundred forty-two thousand, one hundred twenty-three".