21333202121 has 16 divisors (see below), whose sum is σ = 27753643008. Its totient is φ = 15900522000.

The previous prime is 21333202117. The next prime is 21333202127. The reversal of 21333202121 is 12120233312.

It is not a de Polignac number, because 21333202121 - 2² = 21333202117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21333202093 and 21333202102.

It is not an unprimeable number, because it can be changed into a prime (21333202127) 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, 6021155 + ... + 6024696.

It is an arithmetic number, because the mean of its divisors is an integer number (1734602688).

Almost surely, 2^21333202121 is an apocalyptic number.

It is an amenable number.

21333202121 is a deficient number, since it is larger than the sum of its proper divisors (6420440887).

21333202121 is a wasteful number, since it uses less digits than its factorization.

21333202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12045892.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21333202121 its reverse (12120233312), we get a palindrome (33453435433).

The spelling of 21333202121 in words is "twenty-one billion, three hundred thirty-three million, two hundred two thousand, one hundred twenty-one".