21141247899 has 16 divisors (see below), whose sum is σ = 28386243072. Its totient is φ = 13995553728.

The previous prime is 21141247877. The next prime is 21141247903. The reversal of 21141247899 is 99874214112.

It is not a de Polignac number, because 21141247899 - 2¹⁵ = 21141215131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21141245899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204154 + ... + 289760.

It is an arithmetic number, because the mean of its divisors is an integer number (1774140192).

Almost surely, 2^21141247899 is an apocalyptic number.

21141247899 is a deficient number, since it is larger than the sum of its proper divisors (7244995173).

21141247899 is a wasteful number, since it uses less digits than its factorization.

21141247899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86186.

The product of its digits is 290304, while the sum is 48.

The spelling of 21141247899 in words is "twenty-one billion, one hundred forty-one million, two hundred forty-seven thousand, eight hundred ninety-nine".