1201121011 has 4 divisors (see below), whose sum is σ = 1201246272. Its totient is φ = 1200995752.

The previous prime is 1201121003. The next prime is 1201121023. The reversal of 1201121011 is 1101211021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101211021 = 131 ⋅8406191.

It is a cyclic number.

It is not a de Polignac number, because 1201121011 - 2³ = 1201121003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201124011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46936 + ... + 67861.

It is an arithmetic number, because the mean of its divisors is an integer number (300311568).

Almost surely, 2^1201121011 is an apocalyptic number.

1201121011 is a deficient number, since it is larger than the sum of its proper divisors (125261).

1201121011 is a wasteful number, since it uses less digits than its factorization.

1201121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125260.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1201121011 is about 34657.1927743722. The cubic root of 1201121011 is about 1062.9893695136.

Adding to 1201121011 its reverse (1101211021), we get a palindrome (2302332032).

The spelling of 1201121011 in words is "one billion, two hundred one million, one hundred twenty-one thousand, eleven".