19388720215097 has 4 divisors (see below), whose sum is σ = 20231708050560. Its totient is φ = 18545732379636.

The previous prime is 19388720215061. The next prime is 19388720215121. The reversal of 19388720215097 is 79051202788391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19388720215097 - 2¹² = 19388720211001 is a prime.

It is a super-2 number, since 2×19388720215097² (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 (19388720215597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421493917697 + ... + 421493917742.

It is an arithmetic number, because the mean of its divisors is an integer number (5057927012640).

Almost surely, 2^{19388720215097} is an apocalyptic number.

It is an amenable number.

19388720215097 is a deficient number, since it is larger than the sum of its proper divisors (842987835463).

19388720215097 is an equidigital number, since it uses as much as digits as its factorization.

19388720215097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842987835462.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 19388720215097 in words is "nineteen trillion, three hundred eighty-eight billion, seven hundred twenty million, two hundred fifteen thousand, ninety-seven".