21722755507 has 2 divisors, whose sum is σ = 21722755508. Its totient is φ = 21722755506.

The previous prime is 21722755471. The next prime is 21722755577. The reversal of 21722755507 is 70555722712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21722755507 - 2²³ = 21714366899 is a prime.

It is not a weakly prime, because it can be changed into another prime (21722755577) 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, 10861377753 + 10861377754.

It is an arithmetic number, because the mean of its divisors is an integer number (10861377754).

Almost surely, 2^21722755507 is an apocalyptic number.

21722755507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21722755507 is an equidigital number, since it uses as much as digits as its factorization.

21722755507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 343000, while the sum is 43.

The spelling of 21722755507 in words is "twenty-one billion, seven hundred twenty-two million, seven hundred fifty-five thousand, five hundred seven".