102100220121 has 4 divisors (see below), whose sum is σ = 136133626832. Its totient is φ = 68066813412.

The previous prime is 102100220077. The next prime is 102100220137. The reversal of 102100220121 is 121022001201.

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 not a de Polignac number, because 102100220121 - 2²⁵ = 102066665689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102100220097 and 102100220106.

It is not an unprimeable number, because it can be changed into a prime (102100220821) 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, 17016703351 + ... + 17016703356.

It is an arithmetic number, because the mean of its divisors is an integer number (34033406708).

Almost surely, 2^102100220121 is an apocalyptic number.

It is an amenable number.

102100220121 is a deficient number, since it is larger than the sum of its proper divisors (34033406711).

102100220121 is an equidigital number, since it uses as much as digits as its factorization.

102100220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34033406710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102100220121 its reverse (121022001201), we get a palindrome (223122221322).

The spelling of 102100220121 in words is "one hundred two billion, one hundred million, two hundred twenty thousand, one hundred twenty-one".