21044654983758 has 64 divisors (see below), whose sum is σ = 48555076239360. Its totient is φ = 5956277628672.

The previous prime is 21044654983747. The next prime is 21044654983771. The reversal of 21044654983758 is 85738945644012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 462138 + ... + 6504066.

It is an arithmetic number, because the mean of its divisors is an integer number (758673066240).

It is a 2-persistent number, because it is pandigital, and so is 2⋅21044654983758 = 42089309967516, but 3⋅21044654983758 = 63133964951274 is not.

Almost surely, 2^{21044654983758} is an apocalyptic number.

21044654983758 is an abundant number, since it is smaller than the sum of its proper divisors (27510421255602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21044654983758 is a wasteful number, since it uses less digits than its factorization.

21044654983758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042721.

The product of its (nonzero) digits is 232243200, while the sum is 66.

The spelling of 21044654983758 in words is "twenty-one trillion, forty-four billion, six hundred fifty-four million, nine hundred eighty-three thousand, seven hundred fifty-eight".