21051000049 has 16 divisors (see below), whose sum is σ = 22544928000. Its totient is φ = 19595984400.

The previous prime is 21051000029. The next prime is 21051000059. The reversal of 21051000049 is 94000015012.

It is not a de Polignac number, because 21051000049 - 2²⁷ = 20916782321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21050999993 and 21051000029.

It is not an unprimeable number, because it can be changed into a prime (21051000029) 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, 4727274 + ... + 4731724.

It is an arithmetic number, because the mean of its divisors is an integer number (1409058000).

Almost surely, 2^21051000049 is an apocalyptic number.

It is an amenable number.

21051000049 is a deficient number, since it is larger than the sum of its proper divisors (1493927951).

21051000049 is a wasteful number, since it uses less digits than its factorization.

21051000049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8748.

The product of its (nonzero) digits is 360, while the sum is 22.

The spelling of 21051000049 in words is "twenty-one billion, fifty-one million, forty-nine", and thus it is an aban number and an uban number.