21033222021 has 32 divisors (see below), whose sum is σ = 36338592000. Its totient is φ = 12018978720.

The previous prime is 21033221929. The next prime is 21033222031. The reversal of 21033222021 is 12022233012.

It is not a de Polignac number, because 21033222021 - 2⁹ = 21033221509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033221985 and 21033222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033222031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1126320 + ... + 1144841.

It is an arithmetic number, because the mean of its divisors is an integer number (1135581000).

Almost surely, 2^21033222021 is an apocalyptic number.

21033222021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21033222021 is a deficient number, since it is larger than the sum of its proper divisors (15305369979).

21033222021 is an equidigital number, since it uses as much as digits as its factorization.

21033222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271191 (or 2271171 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21033222021 its reverse (12022233012), we get a palindrome (33055455033).

The spelling of 21033222021 in words is "twenty-one billion, thirty-three million, two hundred twenty-two thousand, twenty-one".