102012200021 has 4 divisors (see below), whose sum is σ = 107381263200. Its totient is φ = 96643136844.

The previous prime is 102012200011. The next prime is 102012200057. The reversal of 102012200021 is 120002210201.

It is a happy number.

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: 120002210201 = 79 ⋅1519015319.

It is a cyclic number.

It is not a de Polignac number, because 102012200021 - 2⁶ = 102012199957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102012199975 and 102012200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102012200011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2684531561 + ... + 2684531598.

It is an arithmetic number, because the mean of its divisors is an integer number (26845315800).

Almost surely, 2^102012200021 is an apocalyptic number.

It is an amenable number.

102012200021 is a deficient number, since it is larger than the sum of its proper divisors (5369063179).

102012200021 is an equidigital number, since it uses as much as digits as its factorization.

102012200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369063178.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102012200021 its reverse (120002210201), we get a palindrome (222014410222).

The spelling of 102012200021 in words is "one hundred two billion, twelve million, two hundred thousand, twenty-one".