21240208876 has 12 divisors (see below), whose sum is σ = 37171487808. Its totient is φ = 10619783792.

The previous prime is 21240208849. The next prime is 21240208879. The reversal of 21240208876 is 67880204212.

It is a super-2 number, since 2×21240208876² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21240208879) 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 3 ways as a sum of consecutive naturals, for example, 130245 + ... + 243811.

It is an arithmetic number, because the mean of its divisors is an integer number (3097623984).

Almost surely, 2^21240208876 is an apocalyptic number.

It is an amenable number.

21240208876 is a deficient number, since it is larger than the sum of its proper divisors (15931278932).

21240208876 is a wasteful number, since it uses less digits than its factorization.

21240208876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160328 (or 160326 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 21240208876 in words is "twenty-one billion, two hundred forty million, two hundred eight thousand, eight hundred seventy-six".