2102300021 has 4 divisors (see below), whose sum is σ = 2103895200. Its totient is φ = 2100704844.

The previous prime is 2102300009. The next prime is 2102300029. The reversal of 2102300021 is 1200032012.

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.

It is a cyclic number.

It is not a de Polignac number, because 2102300021 - 2⁶ = 2102299957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102299975 and 2102300011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102300029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795611 + ... + 798248.

It is an arithmetic number, because the mean of its divisors is an integer number (525973800).

Almost surely, 2^2102300021 is an apocalyptic number.

It is an amenable number.

2102300021 is a deficient number, since it is larger than the sum of its proper divisors (1595179).

2102300021 is a wasteful number, since it uses less digits than its factorization.

2102300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595178.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2102300021 is about 45850.8453684335. The cubic root of 2102300021 is about 1281.0465117059.

Adding to 2102300021 its reverse (1200032012), we get a palindrome (3302332033).

The spelling of 2102300021 in words is "two billion, one hundred two million, three hundred thousand, twenty-one".