21322121011221 has 32 divisors (see below), whose sum is σ = 29348792782848. Its totient is φ = 13760881983360.

The previous prime is 21322121011201. The next prime is 21322121011271. The reversal of 21322121011221 is 12211012122312.

It is a de Polignac number, because none of the positive numbers 2^k-21322121011221 is a prime.

It is a super-3 number, since 3×21322121011221³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322121011201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7154650 + ... + 9686756.

It is an arithmetic number, because the mean of its divisors is an integer number (917149774464).

Almost surely, 2^{21322121011221} is an apocalyptic number.

It is an amenable number.

21322121011221 is a deficient number, since it is larger than the sum of its proper divisors (8026671771627).

21322121011221 is a wasteful number, since it uses less digits than its factorization.

21322121011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532681.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21322121011221 its reverse (12211012122312), we get a palindrome (33533133133533).

The spelling of 21322121011221 in words is "twenty-one trillion, three hundred twenty-two billion, one hundred twenty-one million, eleven thousand, two hundred twenty-one".