121221220201 has 4 divisors (see below), whose sum is σ = 122421430404. Its totient is φ = 120021010000.

The previous prime is 121221220189. The next prime is 121221220213. The reversal of 121221220201 is 102022122121.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (121221220189) and next prime (121221220213).

It can be written as a sum of positive squares in 2 ways, for example, as 117614016601 + 3607203600 = 342949^2 + 60060^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221220201 - 2¹³ = 121221212009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221220271) 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, 600104950 + ... + 600105151.

It is an arithmetic number, because the mean of its divisors is an integer number (30605357601).

Almost surely, 2^121221220201 is an apocalyptic number.

It is an amenable number.

121221220201 is a deficient number, since it is larger than the sum of its proper divisors (1200210203).

121221220201 is a wasteful number, since it uses less digits than its factorization.

121221220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200210202.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221220201 its reverse (102022122121), we get a palindrome (223243342322).

The spelling of 121221220201 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred one".