22101212021221 has 24 divisors (see below), whose sum is σ = 22965158332800. Its totient is φ = 21260034496896.

The previous prime is 22101212021191. The next prime is 22101212021233. The reversal of 22101212021221 is 12212021210122.

It is a de Polignac number, because none of the positive numbers 2^k-22101212021221 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 (22101212021321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1055091070 + ... + 1055112016.

It is an arithmetic number, because the mean of its divisors is an integer number (956881597200).

Almost surely, 2^{22101212021221} is an apocalyptic number.

It is an amenable number.

22101212021221 is a deficient number, since it is larger than the sum of its proper divisors (863946311579).

22101212021221 is an equidigital number, since it uses as much as digits as its factorization.

22101212021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27561 (or 27502 counting only the distinct ones).

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

Adding to 22101212021221 its reverse (12212021210122), we get a palindrome (34313233231343).

The spelling of 22101212021221 in words is "twenty-two trillion, one hundred one billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".