102120200021 has 8 divisors (see below), whose sum is σ = 117779523840. Its totient is φ = 86728557168.

The previous prime is 102120199991. The next prime is 102120200033. The reversal of 102120200021 is 120002021201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 102120200021 - 2⁶ = 102120199957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102120199975 and 102120200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120200321) 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, 66919421 + ... + 66920946.

It is an arithmetic number, because the mean of its divisors is an integer number (14722440480).

Almost surely, 2^102120200021 is an apocalyptic number.

It is an amenable number.

102120200021 is a deficient number, since it is larger than the sum of its proper divisors (15659323819).

102120200021 is a wasteful number, since it uses less digits than its factorization.

102120200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133840483.

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

Adding to 102120200021 its reverse (120002021201), we get a palindrome (222122221222).

The spelling of 102120200021 in words is "one hundred two billion, one hundred twenty million, two hundred thousand, twenty-one".