21321221001121 has 8 divisors (see below), whose sum is σ = 21392548579584. Its totient is φ = 21249911183520.

The previous prime is 21321221001037. The next prime is 21321221001191. The reversal of 21321221001121 is 12110012212312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21321221001121 - 2⁹ = 21321221000609 is a prime.

It is a super-3 number, since 3×21321221001121³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321221001191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2033100 + ... + 6839293.

It is an arithmetic number, because the mean of its divisors is an integer number (2674068572448).

Almost surely, 2^{21321221001121} is an apocalyptic number.

It is an amenable number.

21321221001121 is a deficient number, since it is larger than the sum of its proper divisors (71327578463).

21321221001121 is an equidigital number, since it uses as much as digits as its factorization.

21321221001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880431.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21321221001121 its reverse (12110012212312), we get a palindrome (33431233213433).

The spelling of 21321221001121 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twenty-one million, one thousand, one hundred twenty-one".