121021021101001 has 16 divisors (see below), whose sum is σ = 138752830811520. Its totient is φ = 103400016497280.

The previous prime is 121021021100989. The next prime is 121021021101007. The reversal of 121021021101001 is 100101120120121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121021021101001 - 2¹¹ = 121021021098953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021021101007) 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, 44412765 + ... + 47058853.

It is an arithmetic number, because the mean of its divisors is an integer number (8672051925720).

Almost surely, 2^{121021021101001} is an apocalyptic number.

It is an amenable number.

121021021101001 is a deficient number, since it is larger than the sum of its proper divisors (17731809710519).

121021021101001 is a wasteful number, since it uses less digits than its factorization.

121021021101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667024.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121021021101001 its reverse (100101120120121), we get a palindrome (221122141221122).

The spelling of 121021021101001 in words is "one hundred twenty-one trillion, twenty-one billion, twenty-one million, one hundred one thousand, one".