1201321123 has 2 divisors, whose sum is σ = 1201321124. Its totient is φ = 1201321122.

The previous prime is 1201321117. The next prime is 1201321127. The reversal of 1201321123 is 3211231021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201321123 is a prime.

It is a super-2 number, since 2×1201321123² = 2886344881131962258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201321097 and 1201321106.

It is not a weakly prime, because it can be changed into another prime (1201321127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600660561 + 600660562.

It is an arithmetic number, because the mean of its divisors is an integer number (600660562).

Almost surely, 2^1201321123 is an apocalyptic number.

1201321123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201321123 is an equidigital number, since it uses as much as digits as its factorization.

1201321123 is an evil number, because the sum of its binary digits is even.

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

The square root of 1201321123 is about 34660.0796738842. The cubic root of 1201321123 is about 1063.0483991241.

Adding to 1201321123 its reverse (3211231021), we get a palindrome (4412552144).

The spelling of 1201321123 in words is "one billion, two hundred one million, three hundred twenty-one thousand, one hundred twenty-three".