21518150803 has 2 divisors, whose sum is σ = 21518150804. Its totient is φ = 21518150802.

The previous prime is 21518150747. The next prime is 21518150813. The reversal of 21518150803 is 30805181512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21518150803 is a prime.

It is not a weakly prime, because it can be changed into another prime (21518150813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10759075401 + 10759075402.

It is an arithmetic number, because the mean of its divisors is an integer number (10759075402).

Almost surely, 2^21518150803 is an apocalyptic number.

21518150803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21518150803 is an equidigital number, since it uses as much as digits as its factorization.

21518150803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 34.

The spelling of 21518150803 in words is "twenty-one billion, five hundred eighteen million, one hundred fifty thousand, eight hundred three".