121321123 has 16 divisors (see below), whose sum is σ = 156476160. Its totient is φ = 91274400.

The previous prime is 121321097. The next prime is 121321127. The reversal of 121321123 is 321123121.

It is not a de Polignac number, because 121321123 - 2²¹ = 119223971 is a prime.

It is a super-2 number, since 2×121321123² = 29437629771962258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121321097 and 121321106.

It is not an unprimeable number, because it can be changed into a prime (121321127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24933 + ... + 29398.

It is an arithmetic number, because the mean of its divisors is an integer number (9779760).

Almost surely, 2^121321123 is an apocalyptic number.

121321123 is a deficient number, since it is larger than the sum of its proper divisors (35155037).

121321123 is a wasteful number, since it uses less digits than its factorization.

121321123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54378.

The product of its digits is 72, while the sum is 16.

The square root of 121321123 is about 11014.5868283835. The cubic root of 121321123 is about 495.0459067039.

Adding to 121321123 its reverse (321123121), we get a palindrome (442444244).

It can be divided in two parts, 121 and 321123, that multiplied together give a palindrome (38855883).

The spelling of 121321123 in words is "one hundred twenty-one million, three hundred twenty-one thousand, one hundred twenty-three".