121220222101 has 4 divisors (see below), whose sum is σ = 132240242304. Its totient is φ = 110200201900.

The previous prime is 121220222059. The next prime is 121220222113. The reversal of 121220222101 is 101222022121.

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 121220222101 - 2¹⁵ = 121220189333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220222701) 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, 5510010085 + ... + 5510010106.

It is an arithmetic number, because the mean of its divisors is an integer number (33060060576).

Almost surely, 2^121220222101 is an apocalyptic number.

121220222101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220222101 is a deficient number, since it is larger than the sum of its proper divisors (11020020203).

121220222101 is a wasteful number, since it uses less digits than its factorization.

121220222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11020020202.

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

Adding to 121220222101 its reverse (101222022121), we get a palindrome (222442244222).

The spelling of 121220222101 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred one".