1210001121 has 24 divisors (see below), whose sum is σ = 2051451584. Its totient is φ = 672740640.

The previous prime is 1210001119. The next prime is 1210001147. The reversal of 1210001121 is 1211000121.

It is a happy number.

It is not a de Polignac number, because 1210001121 - 2¹ = 1210001119 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 (1210001101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 257215 + ... + 261876.

Almost surely, 2^1210001121 is an apocalyptic number.

It is an amenable number.

1210001121 is a deficient number, since it is larger than the sum of its proper divisors (841450463).

1210001121 is a wasteful number, since it uses less digits than its factorization.

1210001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519141 (or 519138 counting only the distinct ones).

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

The square root of 1210001121 is about 34785.0703750905. The cubic root of 1210001121 is about 1065.6025658409.

Adding to 1210001121 its reverse (1211000121), we get a palindrome (2421001242).

The spelling of 1210001121 in words is "one billion, two hundred ten million, one thousand, one hundred twenty-one".