21120201121 has 8 divisors (see below), whose sum is σ = 21170145024. Its totient is φ = 21070311600.

The previous prime is 21120201119. The next prime is 21120201143. The reversal of 21120201121 is 12110202112.

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 21120201121 - 2¹ = 21120201119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120201101) 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, 823920 + ... + 849166.

It is an arithmetic number, because the mean of its divisors is an integer number (2646268128).

Almost surely, 2^21120201121 is an apocalyptic number.

It is an amenable number.

21120201121 is a deficient number, since it is larger than the sum of its proper divisors (49943903).

21120201121 is a wasteful number, since it uses less digits than its factorization.

21120201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27191.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120201121 its reverse (12110202112), we get a palindrome (33230403233).

Subtracting from 21120201121 its reverse (12110202112), we obtain a palindrome (9009999009).

The spelling of 21120201121 in words is "twenty-one billion, one hundred twenty million, two hundred one thousand, one hundred twenty-one".