21361729575 has 24 divisors (see below), whose sum is σ = 35416483200. Its totient is φ = 11361172960.

The previous prime is 21361729547. The next prime is 21361729577. The reversal of 21361729575 is 57592716312.

It is not a de Polignac number, because 21361729575 - 2⁶ = 21361729511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361729577) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369765 + ... + 423614.

It is an arithmetic number, because the mean of its divisors is an integer number (1475686800).

Almost surely, 2^21361729575 is an apocalyptic number.

21361729575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21361729575 is a deficient number, since it is larger than the sum of its proper divisors (14054753625).

21361729575 is a wasteful number, since it uses less digits than its factorization.

21361729575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793751 (or 793746 counting only the distinct ones).

The product of its digits is 793800, while the sum is 48.

The spelling of 21361729575 in words is "twenty-one billion, three hundred sixty-one million, seven hundred twenty-nine thousand, five hundred seventy-five".