19357721041 has 4 divisors (see below), whose sum is σ = 20496410532. Its totient is φ = 18219031552.

The previous prime is 19357721027. The next prime is 19357721051. The reversal of 19357721041 is 14012775391.

It is a happy number.

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 5416960000 + 13940761041 = 73600^2 + 118071^2 .

It is a cyclic number.

It is not a de Polignac number, because 19357721041 - 2¹³ = 19357712849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19357720985 and 19357721003.

It is not an unprimeable number, because it can be changed into a prime (19357721021) 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, 569344720 + ... + 569344753.

It is an arithmetic number, because the mean of its divisors is an integer number (5124102633).

Almost surely, 2^19357721041 is an apocalyptic number.

It is an amenable number.

19357721041 is a deficient number, since it is larger than the sum of its proper divisors (1138689491).

19357721041 is a wasteful number, since it uses less digits than its factorization.

19357721041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138689490.

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 19357721041 in words is "nineteen billion, three hundred fifty-seven million, seven hundred twenty-one thousand, forty-one".