1001201121 has 32 divisors (see below), whose sum is σ = 1528074240. Its totient is φ = 647514000.

The previous prime is 1001201101. The next prime is 1001201137. The reversal of 1001201121 is 1211021001.

It is a happy number.

It is not a de Polignac number, because 1001201121 - 2⁹ = 1001200609 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1001201101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172456 + ... + 178166.

It is an arithmetic number, because the mean of its divisors is an integer number (47752320).

Almost surely, 2^1001201121 is an apocalyptic number.

It is an amenable number.

1001201121 is a deficient number, since it is larger than the sum of its proper divisors (526873119).

1001201121 is a wasteful number, since it uses less digits than its factorization.

1001201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5914 (or 5908 counting only the distinct ones).

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

The square root of 1001201121 is about 31641.7622928939. The cubic root of 1001201121 is about 1000.4002134745.

Adding to 1001201121 its reverse (1211021001), we get a palindrome (2212222122).

The spelling of 1001201121 in words is "one billion, one million, two hundred one thousand, one hundred twenty-one".