1201010121 has 24 divisors (see below), whose sum is σ = 1875461120. Its totient is φ = 738027936.

The previous prime is 1201010117. The next prime is 1201010123. The reversal of 1201010121 is 1210101021.

It is a happy number.

It is not a de Polignac number, because 1201010121 - 2² = 1201010117 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 (1201010123) 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, 88585 + ... + 101238.

Almost surely, 2^1201010121 is an apocalyptic number.

It is an amenable number.

1201010121 is a deficient number, since it is larger than the sum of its proper divisors (674450999).

1201010121 is a wasteful number, since it uses less digits than its factorization.

1201010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189885 (or 189882 counting only the distinct ones).

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

The square root of 1201010121 is about 34655.5929252408. The cubic root of 1201010121 is about 1062.9566560407.

Adding to 1201010121 its reverse (1210101021), we get a palindrome (2411111142).

The spelling of 1201010121 in words is "one billion, two hundred one million, ten thousand, one hundred twenty-one".