19221212110021 has 8 divisors (see below), whose sum is σ = 19273567676760. Its totient is φ = 19168927153152.

The previous prime is 19221212109997. The next prime is 19221212110043. The reversal of 19221212110021 is 12001121212291.

It can be written as a sum of positive squares in 4 ways, for example, as 621399547521 + 18599812562500 = 788289^2 + 4312750^2 .

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 19221212110021 - 2¹⁹ = 19221211585733 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 (19221212110421) 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, 17107270 + ... + 18196183.

It is an arithmetic number, because the mean of its divisors is an integer number (2409195959595).

Almost surely, 2^{19221212110021} is an apocalyptic number.

It is an amenable number.

19221212110021 is a deficient number, since it is larger than the sum of its proper divisors (52355566739).

19221212110021 is an equidigital number, since it uses as much as digits as its factorization.

19221212110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35304935.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 19221212110021 in words is "nineteen trillion, two hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, twenty-one".