21120000011221 has 8 divisors (see below), whose sum is σ = 22235824162080. Its totient is φ = 20004600380688.

The previous prime is 21120000011207. The next prime is 21120000011239. The reversal of 21120000011221 is 12211000002112.

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 21120000011221 - 2⁹ = 21120000010709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120000011281) 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, 106027951 + ... + 106226956.

It is an arithmetic number, because the mean of its divisors is an integer number (2779478020260).

Almost surely, 2^{21120000011221} is an apocalyptic number.

It is an amenable number.

21120000011221 is a deficient number, since it is larger than the sum of its proper divisors (1115824150859).

21120000011221 is a wasteful number, since it uses less digits than its factorization.

21120000011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212260163.

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

Adding to 21120000011221 its reverse (12211000002112), we get a palindrome (33331000013333).

The spelling of 21120000011221 in words is "twenty-one trillion, one hundred twenty billion, eleven thousand, two hundred twenty-one".