21221121000121 has 8 divisors (see below), whose sum is σ = 24253152100160. Its totient is φ = 18189200496528.

The previous prime is 21221121000091. The next prime is 21221121000139. The reversal of 21221121000121 is 12100012112212.

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 21221121000121 - 2⁵ = 21221121000089 is a prime.

It is a super-2 number, since 2×21221121000121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221121000095 and 21221121000104.

It is not an unprimeable number, because it can be changed into a prime (21221121000181) 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, 27237531 + ... + 28005808.

It is an arithmetic number, because the mean of its divisors is an integer number (3031644012520).

Almost surely, 2^{21221121000121} is an apocalyptic number.

It is an amenable number.

21221121000121 is a deficient number, since it is larger than the sum of its proper divisors (3032031100039).

21221121000121 is an equidigital number, since it uses as much as digits as its factorization.

21221121000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55298223.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221121000121 its reverse (12100012112212), we get a palindrome (33321133112333).

The spelling of 21221121000121 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.