21500341955 has 8 divisors (see below), whose sum is σ = 27158326800. Its totient is φ = 16294995936.

The previous prime is 21500341931. The next prime is 21500341957. The reversal of 21500341955 is 55914300512.

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 21500341955 - 2¹⁰ = 21500340931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21500341957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113159600 + ... + 113159789.

It is an arithmetic number, because the mean of its divisors is an integer number (3394790850).

Almost surely, 2^21500341955 is an apocalyptic number.

21500341955 is a deficient number, since it is larger than the sum of its proper divisors (5657984845).

21500341955 is a wasteful number, since it uses less digits than its factorization.

21500341955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226319413.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 21500341955 in words is "twenty-one billion, five hundred million, three hundred forty-one thousand, nine hundred fifty-five".