21197103919 has 2 divisors, whose sum is σ = 21197103920. Its totient is φ = 21197103918.

The previous prime is 21197103913. The next prime is 21197103929. The reversal of 21197103919 is 91930179112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21197103919 - 2¹⁷ = 21196972847 is a prime.

It is a super-2 number, since 2×21197103919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21197103913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10598551959 + 10598551960.

It is an arithmetic number, because the mean of its divisors is an integer number (10598551960).

Almost surely, 2^21197103919 is an apocalyptic number.

21197103919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21197103919 is an equidigital number, since it uses as much as digits as its factorization.

21197103919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 43.

The spelling of 21197103919 in words is "twenty-one billion, one hundred ninety-seven million, one hundred three thousand, nine hundred nineteen".