1201021123 has 4 divisors (see below), whose sum is σ = 1201090528. Its totient is φ = 1200951720.

The previous prime is 1201021111. The next prime is 1201021139. The reversal of 1201021123 is 3211201021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3211201021 = 7 ⋅458743003.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201021123 is a prime.

It is a super-2 number, since 2×1201021123² = 2884903475784362258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201031123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14665 + ... + 51157.

It is an arithmetic number, because the mean of its divisors is an integer number (300272632).

Almost surely, 2^1201021123 is an apocalyptic number.

1201021123 is a deficient number, since it is larger than the sum of its proper divisors (69405).

1201021123 is an equidigital number, since it uses as much as digits as its factorization.

1201021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69404.

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

The square root of 1201021123 is about 34655.7516582746. The cubic root of 1201021123 is about 1062.9599018122.

Adding to 1201021123 its reverse (3211201021), we get a palindrome (4412222144).

It can be divided in two parts, 12010 and 21123, that added together give a palindrome (33133).

The spelling of 1201021123 in words is "one billion, two hundred one million, twenty-one thousand, one hundred twenty-three".