20124397571 has 2 divisors, whose sum is σ = 20124397572. Its totient is φ = 20124397570.

The previous prime is 20124397541. The next prime is 20124397583. The reversal of 20124397571 is 17579342102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20124397571 - 2²² = 20120203267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20124397541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062198785 + 10062198786.

It is an arithmetic number, because the mean of its divisors is an integer number (10062198786).

Almost surely, 2^20124397571 is an apocalyptic number.

20124397571 is a deficient number, since it is larger than the sum of its proper divisors (1).

20124397571 is an equidigital number, since it uses as much as digits as its factorization.

20124397571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 20124397571 in words is "twenty billion, one hundred twenty-four million, three hundred ninety-seven thousand, five hundred seventy-one".