102120120100021 has 8 divisors (see below), whose sum is σ = 107497493667200. Its totient is φ = 96743009573280.

The previous prime is 102120120099953. The next prime is 102120120100051. The reversal of 102120120100021 is 120001021021201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102120120100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102120120099974 and 102120120100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120120100051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64962960 + ... + 66516361.

It is an arithmetic number, because the mean of its divisors is an integer number (13437186708400).

Almost surely, 2^{102120120100021} is an apocalyptic number.

It is an amenable number.

102120120100021 is a deficient number, since it is larger than the sum of its proper divisors (5377373567179).

102120120100021 is a wasteful number, since it uses less digits than its factorization.

102120120100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131520219.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102120120100021 its reverse (120001021021201), we get a palindrome (222121141121222).

The spelling of 102120120100021 in words is "one hundred two trillion, one hundred twenty billion, one hundred twenty million, one hundred thousand, twenty-one".