21098142905 has 48 divisors (see below), whose sum is σ = 30484905984. Its totient is φ = 13962130560.

The previous prime is 21098142899. The next prime is 21098142907. The reversal of 21098142905 is 50924189012.

It is not a de Polignac number, because 21098142905 - 2⁶ = 21098142841 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21098142907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2905259 + ... + 2912511.

It is an arithmetic number, because the mean of its divisors is an integer number (635102208).

Almost surely, 2^21098142905 is an apocalyptic number.

It is an amenable number.

21098142905 is a deficient number, since it is larger than the sum of its proper divisors (9386763079).

21098142905 is a wasteful number, since it uses less digits than its factorization.

21098142905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7686 (or 7679 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 21098142905 in words is "twenty-one billion, ninety-eight million, one hundred forty-two thousand, nine hundred five".