19315242101 has 4 divisors (see below), whose sum is σ = 19320285132. Its totient is φ = 19310199072.

The previous prime is 19315242097. The next prime is 19315242113. The reversal of 19315242101 is 10124251391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12017640625 + 7297601476 = 109625^2 + 85426^2 .

It is a cyclic number.

It is not a de Polignac number, because 19315242101 - 2² = 19315242097 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 (19315242301) 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, 2515766 + ... + 2523431.

It is an arithmetic number, because the mean of its divisors is an integer number (4830071283).

Almost surely, 2^19315242101 is an apocalyptic number.

It is an amenable number.

19315242101 is a deficient number, since it is larger than the sum of its proper divisors (5043031).

19315242101 is an equidigital number, since it uses as much as digits as its factorization.

19315242101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043030.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 19315242101 its reverse (10124251391), we get a palindrome (29439493492).

The spelling of 19315242101 in words is "nineteen billion, three hundred fifteen million, two hundred forty-two thousand, one hundred one".