102121123213 has 4 divisors (see below), whose sum is σ = 102141754528. Its totient is φ = 102100491900.

The previous prime is 102121123207. The next prime is 102121123217. The reversal of 102121123213 is 312321121201.

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: 312321121201 = 71 ⋅4398889031.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102121123213 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 (102121123217) 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, 10308231 + ... + 10318132.

It is an arithmetic number, because the mean of its divisors is an integer number (25535438632).

Almost surely, 2^102121123213 is an apocalyptic number.

It is an amenable number.

102121123213 is a deficient number, since it is larger than the sum of its proper divisors (20631315).

102121123213 is an equidigital number, since it uses as much as digits as its factorization.

102121123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20631314.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 102121123213 its reverse (312321121201), we get a palindrome (414442244414).

The spelling of 102121123213 in words is "one hundred two billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred thirteen".