121220210101 has 4 divisors (see below), whose sum is σ = 121221433900. Its totient is φ = 121218986304.

The previous prime is 121220210077. The next prime is 121220210107. The reversal of 121220210101 is 101012022121.

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 84873168900 + 36347041201 = 291330^2 + 190649^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220210101 - 2³¹ = 119072726453 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 (121220210107) 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, 448836 + ... + 666253.

It is an arithmetic number, because the mean of its divisors is an integer number (30305358475).

Almost surely, 2^121220210101 is an apocalyptic number.

It is an amenable number.

121220210101 is a deficient number, since it is larger than the sum of its proper divisors (1223799).

121220210101 is a wasteful number, since it uses less digits than its factorization.

121220210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223798.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121220210101 its reverse (101012022121), we get a palindrome (222232232222).

The spelling of 121220210101 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred one".