1200101121 has 12 divisors (see below), whose sum is σ = 1733955600. Its totient is φ = 799847640.

The previous prime is 1200101099. The next prime is 1200101131. The reversal of 1200101121 is 1211010021.

It is a happy number.

It is not a de Polignac number, because 1200101121 - 2¹⁷ = 1199970049 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200101131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20626 + ... + 53156.

It is an arithmetic number, because the mean of its divisors is an integer number (144496300).

Almost surely, 2^1200101121 is an apocalyptic number.

It is an amenable number.

1200101121 is a deficient number, since it is larger than the sum of its proper divisors (533854479).

1200101121 is a wasteful number, since it uses less digits than its factorization.

1200101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36636 (or 36633 counting only the distinct ones).

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

The square root of 1200101121 is about 34642.4756765448. The cubic root of 1200101121 is about 1062.6884175379.

Adding to 1200101121 its reverse (1211010021), we get a palindrome (2411111142).

The spelling of 1200101121 in words is "one billion, two hundred million, one hundred one thousand, one hundred twenty-one".