102122001221 has 4 divisors (see below), whose sum is σ = 102640387212. Its totient is φ = 101603615232.

The previous prime is 102122001209. The next prime is 102122001229. The reversal of 102122001221 is 122100221201.

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 101562678721 + 559322500 = 318689^2 + 23650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102122001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102122001196 and 102122001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102122001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259192700 + ... + 259193093.

It is an arithmetic number, because the mean of its divisors is an integer number (25660096803).

Almost surely, 2^102122001221 is an apocalyptic number.

It is an amenable number.

102122001221 is a deficient number, since it is larger than the sum of its proper divisors (518385991).

102122001221 is an equidigital number, since it uses as much as digits as its factorization.

102122001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518385990.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102122001221 its reverse (122100221201), we get a palindrome (224222222422).

The spelling of 102122001221 in words is "one hundred two billion, one hundred twenty-two million, one thousand, two hundred twenty-one".