121212221201 has 4 divisors (see below), whose sum is σ = 121225563504. Its totient is φ = 121198878900.

The previous prime is 121212221183. The next prime is 121212221219. The reversal of 121212221201 is 102122212121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 102122212121 = 9091 ⋅11233331.

It is an interprime number because it is at equal distance from previous prime (121212221183) and next prime (121212221219).

It is a cyclic number.

It is not a de Polignac number, because 121212221201 - 2²⁶ = 121145112337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121212221201.

It is not an unprimeable number, because it can be changed into a prime (121212221231) 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, 6657515 + ... + 6675696.

It is an arithmetic number, because the mean of its divisors is an integer number (30306390876).

Almost surely, 2^121212221201 is an apocalyptic number.

It is an amenable number.

121212221201 is a deficient number, since it is larger than the sum of its proper divisors (13342303).

121212221201 is an equidigital number, since it uses as much as digits as its factorization.

121212221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13342302.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121212221201 its reverse (102122212121), we get a palindrome (223334433322).

It can be divided in two parts, 12121 and 2221201, that added together give a palindrome (2233322).

The spelling of 121212221201 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred one".