21033031221121 has 4 divisors (see below), whose sum is σ = 21049173226432. Its totient is φ = 21016889215812.

The previous prime is 21033031221091. The next prime is 21033031221133. The reversal of 21033031221121 is 12112213033012.

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 21033031221121 - 2¹³ = 21033031212929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033031221092 and 21033031221101.

It is not an unprimeable number, because it can be changed into a prime (21033031221221) 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, 8071000701 + ... + 8071003306.

It is an arithmetic number, because the mean of its divisors is an integer number (5262293306608).

Almost surely, 2^{21033031221121} is an apocalyptic number.

It is an amenable number.

21033031221121 is a deficient number, since it is larger than the sum of its proper divisors (16142005311).

21033031221121 is a wasteful number, since it uses less digits than its factorization.

21033031221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16142005310.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21033031221121 its reverse (12112213033012), we get a palindrome (33145244254133).

The spelling of 21033031221121 in words is "twenty-one trillion, thirty-three billion, thirty-one million, two hundred twenty-one thousand, one hundred twenty-one".