102100101221 has 4 divisors (see below), whose sum is σ = 102101950944. Its totient is φ = 102098251500.

The previous prime is 102100101199. The next prime is 102100101227. The reversal of 102100101221 is 122101001201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122101001201 = 67 ⋅1822403003.

It is a cyclic number.

It is not a de Polignac number, because 102100101221 - 2⁶ = 102100101157 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 (102100101227) 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, 839435 + ... + 953336.

It is an arithmetic number, because the mean of its divisors is an integer number (25525487736).

Almost surely, 2^102100101221 is an apocalyptic number.

It is an amenable number.

102100101221 is a deficient number, since it is larger than the sum of its proper divisors (1849723).

102100101221 is an equidigital number, since it uses as much as digits as its factorization.

102100101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849722.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102100101221 its reverse (122101001201), we get a palindrome (224201102422).

The spelling of 102100101221 in words is "one hundred two billion, one hundred million, one hundred one thousand, two hundred twenty-one".