102120231212221 has 4 divisors (see below), whose sum is σ = 102121318073152. Its totient is φ = 102119144351292.

The previous prime is 102120231212179. The next prime is 102120231212327. The reversal of 102120231212221 is 122212132021201.

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 a cyclic number.

It is not a de Polignac number, because 102120231212221 - 2¹³ = 102120231204029 is a prime.

It is a super-2 number, since 2×102120231212221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102120231212192 and 102120231212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120231215221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543289515 + ... + 543477448.

It is an arithmetic number, because the mean of its divisors is an integer number (25530329518288).

Almost surely, 2^{102120231212221} is an apocalyptic number.

It is an amenable number.

102120231212221 is a deficient number, since it is larger than the sum of its proper divisors (1086860931).

102120231212221 is an equidigital number, since it uses as much as digits as its factorization.

102120231212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086860930.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 102120231212221 its reverse (122212132021201), we get a palindrome (224332363233422).

The spelling of 102120231212221 in words is "one hundred two trillion, one hundred twenty billion, two hundred thirty-one million, two hundred twelve thousand, two hundred twenty-one".