102120002120 has 16 divisors (see below), whose sum is σ = 229770004860. Its totient is φ = 40848000832.

The previous prime is 102120002081. The next prime is 102120002123. The reversal of 102120002120 is 21200021201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 100843083364 + 1276918756 = 317558^2 + 35734^2 .

It is not an unprimeable number, because it can be changed into a prime (102120002123) 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, 1276499987 + ... + 1276500066.

Almost surely, 2^102120002120 is an apocalyptic number.

102120002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102120002120 is an abundant number, since it is smaller than the sum of its proper divisors (127650002740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102120002120 is a wasteful number, since it uses less digits than its factorization.

102120002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553000064 (or 2553000060 counting only the distinct ones).

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

Adding to 102120002120 its reverse (21200021201), we get a palindrome (123320023321).

The spelling of 102120002120 in words is "one hundred two billion, one hundred twenty million, two thousand, one hundred twenty".