1000001012121 has 16 divisors (see below), whose sum is σ = 1485679830720. Its totient is φ = 664778759040.

The previous prime is 1000001012111. The next prime is 1000001012141. The reversal of 1000001012121 is 1212101000001.

It is a happy number.

It is not a de Polignac number, because 1000001012121 - 2¹⁴ = 1000000995737 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 (1000001012111) 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, 52450915 + ... + 52469976.

It is an arithmetic number, because the mean of its divisors is an integer number (92854989420).

Almost surely, 2^{1000001012121} is an apocalyptic number.

It is an amenable number.

1000001012121 is a deficient number, since it is larger than the sum of its proper divisors (485678818599).

1000001012121 is a wasteful number, since it uses less digits than its factorization.

1000001012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104921253 (or 104921247 counting only the distinct ones).

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

Adding to 1000001012121 its reverse (1212101000001), we get a palindrome (2212102012122).

The spelling of 1000001012121 in words is "one trillion, one million, twelve thousand, one hundred twenty-one".