20404121519 has 2 divisors, whose sum is σ = 20404121520. Its totient is φ = 20404121518.

The previous prime is 20404121483. The next prime is 20404121581. The reversal of 20404121519 is 91512140402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404121519 - 2²⁸ = 20135686063 is a prime.

It is a super-2 number, since 2×20404121519² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20404121491 and 20404121500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404121119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202060759 + 10202060760.

It is an arithmetic number, because the mean of its divisors is an integer number (10202060760).

Almost surely, 2^20404121519 is an apocalyptic number.

20404121519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404121519 is an equidigital number, since it uses as much as digits as its factorization.

20404121519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 20404121519 in words is "twenty billion, four hundred four million, one hundred twenty-one thousand, five hundred nineteen".