1235401121 has 4 divisors (see below), whose sum is σ = 1235487792. Its totient is φ = 1235314452.

The previous prime is 1235401117. The next prime is 1235401151. The reversal of 1235401121 is 1211045321.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1211045321 = 839 ⋅1443439.

It is a cyclic number.

It is not a de Polignac number, because 1235401121 - 2² = 1235401117 is a prime.

It is a super-3 number, since 3×1235401121³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1235401093 and 1235401102.

It is not an unprimeable number, because it can be changed into a prime (1235401151) 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, 16355 + ... + 52328.

It is an arithmetic number, because the mean of its divisors is an integer number (308871948).

Almost surely, 2^1235401121 is an apocalyptic number.

It is an amenable number.

1235401121 is a deficient number, since it is larger than the sum of its proper divisors (86671).

1235401121 is an equidigital number, since it uses as much as digits as its factorization.

1235401121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86670.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1235401121 is about 35148.2733715328. The cubic root of 1235401121 is about 1073.0072680731.

Adding to 1235401121 its reverse (1211045321), we get a palindrome (2446446442).

The spelling of 1235401121 in words is "one billion, two hundred thirty-five million, four hundred one thousand, one hundred twenty-one".