21498061747 has 2 divisors, whose sum is σ = 21498061748. Its totient is φ = 21498061746.

The previous prime is 21498061721. The next prime is 21498061757. The reversal of 21498061747 is 74716089412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21498061747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21498061747.

It is not a weakly prime, because it can be changed into another prime (21498061757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10749030873 + 10749030874.

It is an arithmetic number, because the mean of its divisors is an integer number (10749030874).

Almost surely, 2^21498061747 is an apocalyptic number.

21498061747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21498061747 is an equidigital number, since it uses as much as digits as its factorization.

21498061747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 21498061747 in words is "twenty-one billion, four hundred ninety-eight million, sixty-one thousand, seven hundred forty-seven".