21022122011221 has 8 divisors (see below), whose sum is σ = 21077857200320. Its totient is φ = 20966388232608.

The previous prime is 21022122011173. The next prime is 21022122011237. The reversal of 21022122011221 is 12211022122012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022122011221 is a prime.

It is a super-2 number, since 2×21022122011221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022122011291) 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, 33896305 + ... + 34510921.

It is an arithmetic number, because the mean of its divisors is an integer number (2634732150040).

Almost surely, 2^{21022122011221} is an apocalyptic number.

It is an amenable number.

21022122011221 is a deficient number, since it is larger than the sum of its proper divisors (55735189099).

21022122011221 is an equidigital number, since it uses as much as digits as its factorization.

21022122011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705243.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21022122011221 its reverse (12211022122012), we get a palindrome (33233144133233).

The spelling of 21022122011221 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".