21300002121 has 16 divisors (see below), whose sum is σ = 29172600000. Its totient is φ = 13813835328.

The previous prime is 21300002077. The next prime is 21300002137. The reversal of 21300002121 is 12120000312.

It is not a de Polignac number, because 21300002121 - 2⁶ = 21300002057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21300002097 and 21300002106.

It is not an unprimeable number, because it can be changed into a prime (21300002221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 819595 + ... + 845183.

It is an arithmetic number, because the mean of its divisors is an integer number (1823287500).

Almost surely, 2^21300002121 is an apocalyptic number.

It is an amenable number.

21300002121 is a deficient number, since it is larger than the sum of its proper divisors (7872597879).

21300002121 is a wasteful number, since it uses less digits than its factorization.

21300002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33128.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21300002121 its reverse (12120000312), we get a palindrome (33420002433).

The spelling of 21300002121 in words is "twenty-one billion, three hundred million, two thousand, one hundred twenty-one".