121221122220001 has 4 divisors (see below), whose sum is σ = 121226426628372. Its totient is φ = 121215817811632.

The previous prime is 121221122219941. The next prime is 121221122220031. The reversal of 121221122220001 is 100022221122121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29596483270225 + 91624638949776 = 5440265^2 + 9572076^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221122220001 - 2³³ = 121212532285409 is a prime.

It is a super-3 number, since 3×121221122220001³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221122220031) 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, 2652169906 + ... + 2652215611.

It is an arithmetic number, because the mean of its divisors is an integer number (30306606657093).

Almost surely, 2^{121221122220001} is an apocalyptic number.

It is an amenable number.

121221122220001 is a deficient number, since it is larger than the sum of its proper divisors (5304408371).

121221122220001 is an equidigital number, since it uses as much as digits as its factorization.

121221122220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5304408370.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221122220001 its reverse (100022221122121), we get a palindrome (221243343342122).

The spelling of 121221122220001 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, one".