121000021021001 has 8 divisors (see below), whose sum is σ = 128128061108520. Its totient is φ = 113873135577088.

The previous prime is 121000021020997. The next prime is 121000021021003. The reversal of 121000021021001 is 100120120000121.

It can be written as a sum of positive squares in 4 ways, for example, as 2505889000000 + 118494132021001 = 1583000^2 + 10885501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121000021021001 - 2² = 121000021020997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121000021021003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288445136 + ... + 288864321.

It is an arithmetic number, because the mean of its divisors is an integer number (16016007638565).

Almost surely, 2^{121000021021001} is an apocalyptic number.

It is an amenable number.

121000021021001 is a deficient number, since it is larger than the sum of its proper divisors (7128040087519).

121000021021001 is a wasteful number, since it uses less digits than its factorization.

121000021021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577321803.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121000021021001 its reverse (100120120000121), we get a palindrome (221120141021122).

The spelling of 121000021021001 in words is "one hundred twenty-one trillion, twenty-one million, twenty-one thousand, one".