21120011210221 has 16 divisors (see below), whose sum is σ = 26891686010880. Its totient is φ = 16106999428080.

The previous prime is 21120011210219. The next prime is 21120011210279. The reversal of 21120011210221 is 12201211002112.

It is not a de Polignac number, because 21120011210221 - 2¹ = 21120011210219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120011210195 and 21120011210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120011213221) 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, 2917931061 + ... + 2917938298.

It is an arithmetic number, because the mean of its divisors is an integer number (1680730375680).

Almost surely, 2^{21120011210221} is an apocalyptic number.

It is an amenable number.

21120011210221 is a deficient number, since it is larger than the sum of its proper divisors (5771674800659).

21120011210221 is a wasteful number, since it uses less digits than its factorization.

21120011210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5835869424.

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

Adding to 21120011210221 its reverse (12201211002112), we get a palindrome (33321222212333).

The spelling of 21120011210221 in words is "twenty-one trillion, one hundred twenty billion, eleven million, two hundred ten thousand, two hundred twenty-one".