21220002111121 has 8 divisors (see below), whose sum is σ = 23149195039584. Its totient is φ = 19290826153920.

The previous prime is 21220002111109. The next prime is 21220002111137. The reversal of 21220002111121 is 12111120002212.

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 21220002111121 - 2⁵ = 21220002111089 is a prime.

It is a super-3 number, since 3×21220002111121³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220002111095 and 21220002111104.

It is not an unprimeable number, because it can be changed into a prime (21220002111101) 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, 1554375 + ... + 6697468.

It is an arithmetic number, because the mean of its divisors is an integer number (2893649379948).

Almost surely, 2^{21220002111121} is an apocalyptic number.

It is an amenable number.

21220002111121 is a deficient number, since it is larger than the sum of its proper divisors (1929192928463).

21220002111121 is a wasteful number, since it uses less digits than its factorization.

21220002111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485631.

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

Adding to 21220002111121 its reverse (12111120002212), we get a palindrome (33331122113333).

The spelling of 21220002111121 in words is "twenty-one trillion, two hundred twenty billion, two million, one hundred eleven thousand, one hundred twenty-one".