102113121221 has 4 divisors (see below), whose sum is σ = 102211973292. Its totient is φ = 102014269152.

The previous prime is 102113121217. The next prime is 102113121239. The reversal of 102113121221 is 122121311201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122121311201 = 197 ⋅619905133.

It can be written as a sum of positive squares in 2 ways, for example, as 100878652996 + 1234468225 = 317614^2 + 35135^2 .

It is a cyclic number.

It is not a de Polignac number, because 102113121221 - 2² = 102113121217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102113121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102113121251) 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, 49424486 + ... + 49426551.

It is an arithmetic number, because the mean of its divisors is an integer number (25552993323).

Almost surely, 2^102113121221 is an apocalyptic number.

It is an amenable number.

102113121221 is a deficient number, since it is larger than the sum of its proper divisors (98852071).

102113121221 is an equidigital number, since it uses as much as digits as its factorization.

102113121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98852070.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 102113121221 its reverse (122121311201), we get a palindrome (224234432422).

The spelling of 102113121221 in words is "one hundred two billion, one hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-one".