102100200001021 has 4 divisors (see below), whose sum is σ = 102100344530044. Its totient is φ = 102100055472000.

The previous prime is 102100200001003. The next prime is 102100200001027. The reversal of 102100200001021 is 120100002001201.

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 79541604332100 + 22558595668921 = 8918610^2 + 4749589^2 .

It is a cyclic number.

It is not a de Polignac number, because 102100200001021 - 2⁵ = 102100200000989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102100200000989 and 102100200001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102100200001027) 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, 71199630 + ... + 72619471.

It is an arithmetic number, because the mean of its divisors is an integer number (25525086132511).

Almost surely, 2^{102100200001021} is an apocalyptic number.

It is an amenable number.

102100200001021 is a deficient number, since it is larger than the sum of its proper divisors (144529023).

102100200001021 is an equidigital number, since it uses as much as digits as its factorization.

102100200001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144529022.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 102100200001021 its reverse (120100002001201), we get a palindrome (222200202002222).

The spelling of 102100200001021 in words is "one hundred two trillion, one hundred billion, two hundred million, one thousand, twenty-one".