121211210021001 has 4 divisors (see below), whose sum is σ = 161614946694672. Its totient is φ = 80807473347332.

The previous prime is 121211210020997. The next prime is 121211210021021. The reversal of 121211210021001 is 100120012112121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121211210021001 - 2² = 121211210020997 is a prime.

It is a super-2 number, since 2×121211210021001² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121211210021021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20201868336831 + ... + 20201868336836.

It is an arithmetic number, because the mean of its divisors is an integer number (40403736673668).

Almost surely, 2^{121211210021001} is an apocalyptic number.

It is an amenable number.

121211210021001 is a deficient number, since it is larger than the sum of its proper divisors (40403736673671).

121211210021001 is an equidigital number, since it uses as much as digits as its factorization.

121211210021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40403736673670.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211210021001 its reverse (100120012112121), we get a palindrome (221331222133122).

The spelling of 121211210021001 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred ten million, twenty-one thousand, one".