1001000120121 has 32 divisors (see below), whose sum is σ = 1494609114240. Its totient is φ = 662094950400.

The previous prime is 1001000120101. The next prime is 1001000120161. The reversal of 1001000120121 is 1210210001001.

It is a happy number.

It is not a de Polignac number, because 1001000120121 - 2¹¹ = 1001000118073 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 (1001000120101) 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, 17631901 + ... + 17688581.

It is an arithmetic number, because the mean of its divisors is an integer number (46706534820).

Almost surely, 2^{1001000120121} is an apocalyptic number.

It is an amenable number.

1001000120121 is a deficient number, since it is larger than the sum of its proper divisors (493608994119).

1001000120121 is a wasteful number, since it uses less digits than its factorization.

1001000120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61814 (or 61808 counting only the distinct ones).

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

Adding to 1001000120121 its reverse (1210210001001), we get a palindrome (2211210121122).

The spelling of 1001000120121 in words is "one trillion, one billion, one hundred twenty thousand, one hundred twenty-one".