21263741005 has 8 divisors (see below), whose sum is σ = 27479296152. Its totient is φ = 15702454848.

The previous prime is 21263740969. The next prime is 21263741029. The reversal of 21263741005 is 50014736212.

It can be written as a sum of positive squares in 4 ways, for example, as 3392596516 + 17871144489 = 58246^2 + 133683^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21263741005 - 2⁷ = 21263740877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 163567174 + ... + 163567303.

It is an arithmetic number, because the mean of its divisors is an integer number (3434912019).

Almost surely, 2^21263741005 is an apocalyptic number.

It is an amenable number.

21263741005 is a deficient number, since it is larger than the sum of its proper divisors (6215555147).

21263741005 is a wasteful number, since it uses less digits than its factorization.

21263741005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327134495.

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21263741005 in words is "twenty-one billion, two hundred sixty-three million, seven hundred forty-one thousand, five".