21221020001121 has 16 divisors (see below), whose sum is σ = 29528059075200. Its totient is φ = 13530795534080.

The previous prime is 21221020001047. The next prime is 21221020001197. The reversal of 21221020001121 is 12110002012212.

It is a cyclic number.

It is not a de Polignac number, because 21221020001121 - 2²⁶ = 21220952892257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221020001121.

It is not an unprimeable number, because it can be changed into a prime (21221020001521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15817896 + ... + 17106953.

It is an arithmetic number, because the mean of its divisors is an integer number (1845503692200).

Almost surely, 2^{21221020001121} is an apocalyptic number.

It is an amenable number.

21221020001121 is a deficient number, since it is larger than the sum of its proper divisors (8307039074079).

21221020001121 is a wasteful number, since it uses less digits than its factorization.

21221020001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32934216.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221020001121 its reverse (12110002012212), we get a palindrome (33331022013333).

The spelling of 21221020001121 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, one thousand, one hundred twenty-one".