21221010001121 has 8 divisors (see below), whose sum is σ = 24285400973760. Its totient is φ = 18164823557328.

The previous prime is 21221010001097. The next prime is 21221010001171. The reversal of 21221010001121 is 12110001012212.

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

It is not a de Polignac number, because 21221010001121 - 2³⁴ = 21203830131937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221010001096 and 21221010001105.

It is not an unprimeable number, because it can be changed into a prime (21221010001171) 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, 2051126666 + ... + 2051137011.

It is an arithmetic number, because the mean of its divisors is an integer number (3035675121720).

Almost surely, 2^{21221010001121} is an apocalyptic number.

It is an amenable number.

21221010001121 is a deficient number, since it is larger than the sum of its proper divisors (3064390972639).

21221010001121 is an equidigital number, since it uses as much as digits as its factorization.

21221010001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102264423.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221010001121 its reverse (12110001012212), we get a palindrome (33331011013333).

The spelling of 21221010001121 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, one thousand, one hundred twenty-one".