10221715505 has 4 divisors (see below), whose sum is σ = 12266058612. Its totient is φ = 8177372400.

The previous prime is 10221715501. The next prime is 10221715541. The reversal of 10221715505 is 50551712201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3425526784 + 6796188721 = 58528^2 + 82439^2 .

It is not a de Polignac number, because 10221715505 - 2² = 10221715501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10221715501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022171546 + ... + 1022171555.

It is an arithmetic number, because the mean of its divisors is an integer number (3066514653).

Almost surely, 2^10221715505 is an apocalyptic number.

It is an amenable number.

10221715505 is a deficient number, since it is larger than the sum of its proper divisors (2044343107).

10221715505 is an equidigital number, since it uses as much as digits as its factorization.

10221715505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044343106.

The product of its (nonzero) digits is 3500, while the sum is 29.

The spelling of 10221715505 in words is "ten billion, two hundred twenty-one million, seven hundred fifteen thousand, five hundred five".