21221001201121 has 8 divisors (see below), whose sum is σ = 22346418715200. Its totient is φ = 20096435958480.

The previous prime is 21221001201053. The next prime is 21221001201167. The reversal of 21221001201121 is 12110210012212.

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 21221001201121 - 2¹³ = 21221001192929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221001201095 and 21221001201104.

It is not an unprimeable number, because it can be changed into a prime (21221001204121) 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, 213016741 + ... + 213116338.

It is an arithmetic number, because the mean of its divisors is an integer number (2793302339400).

Almost surely, 2^{21221001201121} is an apocalyptic number.

It is an amenable number.

21221001201121 is a deficient number, since it is larger than the sum of its proper divisors (1125417514079).

21221001201121 is a wasteful number, since it uses less digits than its factorization.

21221001201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426135719.

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

Adding to 21221001201121 its reverse (12110210012212), we get a palindrome (33331211213333).

The spelling of 21221001201121 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two hundred one thousand, one hundred twenty-one".