1201321023 has 16 divisors (see below), whose sum is σ = 1837201920. Its totient is φ = 683987616.

The previous prime is 1201320943. The next prime is 1201321061. The reversal of 1201321023 is 3201231021.

It is not a de Polignac number, because 1201321023 - 2⁸ = 1201320767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201320993 and 1201321011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201321123) 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, 97443 + ... + 109076.

It is an arithmetic number, because the mean of its divisors is an integer number (114825120).

Almost surely, 2^1201321023 is an apocalyptic number.

1201321023 is a deficient number, since it is larger than the sum of its proper divisors (635880897).

1201321023 is a wasteful number, since it uses less digits than its factorization.

1201321023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206806.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1201321023 is about 34660.0782313024. The cubic root of 1201321023 is about 1063.0483696275.

Adding to 1201321023 its reverse (3201231021), we get a palindrome (4402552044).

The spelling of 1201321023 in words is "one billion, two hundred one million, three hundred twenty-one thousand, twenty-three".