121210112101 has 4 divisors (see below), whose sum is σ = 130533966892. Its totient is φ = 111886257312.

The previous prime is 121210112087. The next prime is 121210112123. The reversal of 121210112101 is 101211012121.

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 18496272001 + 102713840100 = 136001^2 + 320490^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210112101 - 2¹¹ = 121210110053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 9323854777 = 121210112101 / (1 + 2 + 1 + 2 + 1 + 0 + 1 + 1 + 2 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210112201) 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, 4661927376 + ... + 4661927401.

It is an arithmetic number, because the mean of its divisors is an integer number (32633491723).

Almost surely, 2^121210112101 is an apocalyptic number.

It is an amenable number.

121210112101 is a deficient number, since it is larger than the sum of its proper divisors (9323854791).

121210112101 is an equidigital number, since it uses as much as digits as its factorization.

121210112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323854790.

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

Adding to 121210112101 its reverse (101211012121), we get a palindrome (222421124222).

The spelling of 121210112101 in words is "one hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, one hundred one".