1001221123 has 4 divisors (see below), whose sum is σ = 1144252720. Its totient is φ = 858189528.

The previous prime is 1001221097. The next prime is 1001221127. The reversal of 1001221123 is 3211221001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3211221001 = 17 ⋅188895353.

It is not a de Polignac number, because 1001221123 - 2²¹ = 999123971 is a prime.

It is a super-2 number, since 2×1001221123² = 2004887474282762258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001221127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71515788 + ... + 71515801.

It is an arithmetic number, because the mean of its divisors is an integer number (286063180).

Almost surely, 2^1001221123 is an apocalyptic number.

1001221123 is a deficient number, since it is larger than the sum of its proper divisors (143031597).

1001221123 is an equidigital number, since it uses as much as digits as its factorization.

1001221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143031596.

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

The square root of 1001221123 is about 31642.0783609421. The cubic root of 1001221123 is about 1000.4068754299.

Adding to 1001221123 its reverse (3211221001), we get a palindrome (4212442124).

The spelling of 1001221123 in words is "one billion, one million, two hundred twenty-one thousand, one hundred twenty-three".