102111101012021 has 4 divisors (see below), whose sum is σ = 102111719384172. Its totient is φ = 102110482639872.

The previous prime is 102111101011973. The next prime is 102111101012051. The reversal of 102111101012021 is 120210101111201.

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 36883090191025 + 65228010820996 = 6073145^2 + 8076386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102111101012021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102111101011987 and 102111101012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111101012051) 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, 308938316 + ... + 309268661.

It is an arithmetic number, because the mean of its divisors is an integer number (25527929846043).

Almost surely, 2^{102111101012021} is an apocalyptic number.

It is an amenable number.

102111101012021 is a deficient number, since it is larger than the sum of its proper divisors (618372151).

102111101012021 is an equidigital number, since it uses as much as digits as its factorization.

102111101012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618372150.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 102111101012021 its reverse (120210101111201), we get a palindrome (222321202123222).

The spelling of 102111101012021 in words is "one hundred two trillion, one hundred eleven billion, one hundred one million, twelve thousand, twenty-one".