21006500249059 has 8 divisors (see below), whose sum is σ = 23049222334992. Its totient is φ = 19024754941920.

The previous prime is 21006500249057. The next prime is 21006500249089. The reversal of 21006500249059 is 95094200560012.

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

It is not a de Polignac number, because 21006500249059 - 2¹ = 21006500249057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21006500249057) 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, 15244193977 + ... + 15244195354.

It is an arithmetic number, because the mean of its divisors is an integer number (2881152791874).

Almost surely, 2^{21006500249059} is an apocalyptic number.

21006500249059 is a deficient number, since it is larger than the sum of its proper divisors (2042722085933).

21006500249059 is a wasteful number, since it uses less digits than its factorization.

21006500249059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30488389397.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 21006500249059 in words is "twenty-one trillion, six billion, five hundred million, two hundred forty-nine thousand, fifty-nine".