20104717421 has 2 divisors, whose sum is σ = 20104717422. Its totient is φ = 20104717420.

The previous prime is 20104717363. The next prime is 20104717433. The reversal of 20104717421 is 12471740102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19041240100 + 1063477321 = 137990^2 + 32611^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104717421 - 2⁶ = 20104717357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20104716421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052358710 + 10052358711.

It is an arithmetic number, because the mean of its divisors is an integer number (10052358711).

Almost surely, 2^20104717421 is an apocalyptic number.

It is an amenable number.

20104717421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104717421 is an equidigital number, since it uses as much as digits as its factorization.

20104717421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The spelling of 20104717421 in words is "twenty billion, one hundred four million, seven hundred seventeen thousand, four hundred twenty-one".