1001201212121 has 16 divisors (see below), whose sum is σ = 1095626046528. Its totient is φ = 907345612800.

The previous prime is 1001201212013. The next prime is 1001201212139. The reversal of 1001201212121 is 1212121021001.

It is not a de Polignac number, because 1001201212121 - 2¹⁴ = 1001201195737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001201212096 and 1001201212105.

It is not an unprimeable number, because it can be changed into a prime (1001201232121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14297225 + ... + 14367081.

It is an arithmetic number, because the mean of its divisors is an integer number (68476627908).

Almost surely, 2^{1001201212121} is an apocalyptic number.

1001201212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001201212121 is a deficient number, since it is larger than the sum of its proper divisors (94424834407).

1001201212121 is a wasteful number, since it uses less digits than its factorization.

1001201212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73912.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001201212121 its reverse (1212121021001), we get a palindrome (2213322233122).

The spelling of 1001201212121 in words is "one trillion, one billion, two hundred one million, two hundred twelve thousand, one hundred twenty-one".