121211120101 has 4 divisors (see below), whose sum is σ = 121229345772. Its totient is φ = 121192894432.

The previous prime is 121211120099. The next prime is 121211120153. The reversal of 121211120101 is 101021112121.

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 7443203076 + 113767917025 = 86274^2 + 337295^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211120101 - 2¹ = 121211120099 is a prime.

It is a super-2 number, since 2×121211120101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211129101) 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, 9102856 + ... + 9116161.

It is an arithmetic number, because the mean of its divisors is an integer number (30307336443).

Almost surely, 2^121211120101 is an apocalyptic number.

It is an amenable number.

121211120101 is a deficient number, since it is larger than the sum of its proper divisors (18225671).

121211120101 is an equidigital number, since it uses as much as digits as its factorization.

121211120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18225670.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121211120101 its reverse (101021112121), we get a palindrome (222232232222).

The spelling of 121211120101 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred one".