19542721111225 has 81 divisors (see below), whose sum is σ = 27440211769383. Its totient is φ = 13799421018240.

The previous prime is 19542721111223. The next prime is 19542721111253. The reversal of 19542721111225 is 52211112724591.

The square root of 19542721111225 is 4420715.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 19396176083881 + 146545027344 = 4404109^2 + 382812^2 .

It is not a de Polignac number, because 19542721111225 - 2¹ = 19542721111223 is a prime.

It is a super-2 number, since 2×19542721111225² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19542721111223) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 6608967447 + ... + 6608970403.

Almost surely, 2^{19542721111225} is an apocalyptic number.

19542721111225 is the 4420715-th square number.

19542721111225 is the 2210358-th centered octagonal number.

It is an amenable number.

19542721111225 is a deficient number, since it is larger than the sum of its proper divisors (7897490658158).

19542721111225 is an frugal number, since it uses more digits than its factorization.

19542721111225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996 (or 2998 counting only the distinct ones).

The product of its digits is 100800, while the sum is 43.

The spelling of 19542721111225 in words is "nineteen trillion, five hundred forty-two billion, seven hundred twenty-one million, one hundred eleven thousand, two hundred twenty-five".