21333132121 has 4 divisors (see below), whose sum is σ = 24380722432. Its totient is φ = 18285541812.

The previous prime is 21333132103. The next prime is 21333132127. The reversal of 21333132121 is 12123133312.

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 21333132121 - 2⁵ = 21333132089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333132092 and 21333132101.

It is not an unprimeable number, because it can be changed into a prime (21333132127) 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, 1523795145 + ... + 1523795158.

It is an arithmetic number, because the mean of its divisors is an integer number (6095180608).

Almost surely, 2^21333132121 is an apocalyptic number.

It is an amenable number.

21333132121 is a deficient number, since it is larger than the sum of its proper divisors (3047590311).

21333132121 is an equidigital number, since it uses as much as digits as its factorization.

21333132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047590310.

The product of its digits is 648, while the sum is 22.

Adding to 21333132121 its reverse (12123133312), we get a palindrome (33456265433).

The spelling of 21333132121 in words is "twenty-one billion, three hundred thirty-three million, one hundred thirty-two thousand, one hundred twenty-one".