21121241121321 has 64 divisors (see below), whose sum is σ = 32922340399872. Its totient is φ = 11902592000000.

The previous prime is 21121241121271. The next prime is 21121241121329. The reversal of 21121241121321 is 12312114212112.

It is a cyclic number.

It is not a de Polignac number, because 21121241121321 - 2¹⁰ = 21121241120297 is a prime.

It is a super-2 number, since 2×21121241121321² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121241121291 and 21121241121300.

It is not an unprimeable number, because it can be changed into a prime (21121241121329) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25716421 + ... + 26525021.

It is an arithmetic number, because the mean of its divisors is an integer number (514411568748).

Almost surely, 2^{21121241121321} is an apocalyptic number.

It is an amenable number.

21121241121321 is a deficient number, since it is larger than the sum of its proper divisors (11801099278551).

21121241121321 is a wasteful number, since it uses less digits than its factorization.

21121241121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809194.

The product of its digits is 384, while the sum is 24.

Adding to 21121241121321 its reverse (12312114212112), we get a palindrome (33433355333433).

The spelling of 21121241121321 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred forty-one million, one hundred twenty-one thousand, three hundred twenty-one".