123121001 has 4 divisors (see below), whose sum is σ = 128474112. Its totient is φ = 117767892.

The previous prime is 123120973. The next prime is 123121003. The reversal of 123121001 is 100121321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123121001 - 2²² = 118926697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123121003) 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, 2676521 + ... + 2676566.

It is an arithmetic number, because the mean of its divisors is an integer number (32118528).

Almost surely, 2^123121001 is an apocalyptic number.

It is an amenable number.

123121001 is a deficient number, since it is larger than the sum of its proper divisors (5353111).

123121001 is an equidigital number, since it uses as much as digits as its factorization.

123121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353110.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 123121001 is about 11095.9903118199. The cubic root of 123121001 is about 497.4820087263.

Adding to 123121001 its reverse (100121321), we get a palindrome (223242322).

The spelling of 123121001 in words is "one hundred twenty-three million, one hundred twenty-one thousand, one".