121221021021001 has 32 divisors (see below), whose sum is σ = 140256178062336. Its totient is φ = 103543706112000.

The previous prime is 121221021020963. The next prime is 121221021021011. The reversal of 121221021021001 is 100120120122121.

It is not a de Polignac number, because 121221021021001 - 2¹⁵ = 121221020988233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221021021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300131971 + ... + 300535591.

It is an arithmetic number, because the mean of its divisors is an integer number (4383005564448).

Almost surely, 2^{121221021021001} is an apocalyptic number.

121221021021001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221021021001 is a deficient number, since it is larger than the sum of its proper divisors (19035157041335).

121221021021001 is a wasteful number, since it uses less digits than its factorization.

121221021021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406353.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121221021021001 its reverse (100120120122121), we get a palindrome (221341141143122).

The spelling of 121221021021001 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, twenty-one thousand, one".