21041340249 has 16 divisors (see below), whose sum is σ = 29723863680. Its totient is φ = 13194213120.

The previous prime is 21041340233. The next prime is 21041340323. The reversal of 21041340249 is 94204314012.

It is not a de Polignac number, because 21041340249 - 2⁴ = 21041340233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21041340349) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 44589 + ... + 209930.

It is an arithmetic number, because the mean of its divisors is an integer number (1857741480).

Almost surely, 2^21041340249 is an apocalyptic number.

It is an amenable number.

21041340249 is a deficient number, since it is larger than the sum of its proper divisors (8682523431).

21041340249 is a wasteful number, since it uses less digits than its factorization.

21041340249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256160.

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 21041340249 in words is "twenty-one billion, forty-one million, three hundred forty thousand, two hundred forty-nine".