1201121001 has 8 divisors (see below), whose sum is σ = 1779438560. Its totient is φ = 800747316.

The previous prime is 1201120939. The next prime is 1201121003. The reversal of 1201121001 is 1001211021.

It is a happy number.

It is not a de Polignac number, because 1201121001 - 2⁶ = 1201120937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201121003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22242955 + ... + 22243008.

It is an arithmetic number, because the mean of its divisors is an integer number (222429820).

Almost surely, 2^1201121001 is an apocalyptic number.

It is an amenable number.

1201121001 is a deficient number, since it is larger than the sum of its proper divisors (578317559).

1201121001 is an equidigital number, since it uses as much as digits as its factorization.

1201121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44485972 (or 44485966 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1201121001 is about 34657.1926301021. The cubic root of 1201121001 is about 1062.9893665636.

Adding to 1201121001 its reverse (1001211021), we get a palindrome (2202332022).

The spelling of 1201121001 in words is "one billion, two hundred one million, one hundred twenty-one thousand, one".