121222220101 has 4 divisors (see below), whose sum is σ = 122422440204. Its totient is φ = 120022000000.

The previous prime is 121222220099. The next prime is 121222220111. The reversal of 121222220101 is 101022222121.

It is a happy number.

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 101841403876 + 19380816225 = 319126^2 + 139215^2 .

It is a cyclic number.

It is not a de Polignac number, because 121222220101 - 2¹ = 121222220099 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 (121222220111) 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, 600109900 + ... + 600110101.

It is an arithmetic number, because the mean of its divisors is an integer number (30605610051).

Almost surely, 2^121222220101 is an apocalyptic number.

It is an amenable number.

121222220101 is a deficient number, since it is larger than the sum of its proper divisors (1200220103).

121222220101 is a wasteful number, since it uses less digits than its factorization.

121222220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200220102.

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

Adding to 121222220101 its reverse (101022222121), we get a palindrome (222244442222).

The spelling of 121222220101 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, one hundred one".