21722517403 has 2 divisors, whose sum is σ = 21722517404. Its totient is φ = 21722517402.

The previous prime is 21722517373. The next prime is 21722517419. The reversal of 21722517403 is 30471522712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21722517403 is a prime.

It is not a weakly prime, because it can be changed into another prime (21722517433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10861258701 + 10861258702.

It is an arithmetic number, because the mean of its divisors is an integer number (10861258702).

Almost surely, 2^21722517403 is an apocalyptic number.

21722517403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21722517403 is an equidigital number, since it uses as much as digits as its factorization.

21722517403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 21722517403 in words is "twenty-one billion, seven hundred twenty-two million, five hundred seventeen thousand, four hundred three".