21084362268021 has 40 divisors (see below), whose sum is σ = 33937305207960. Its totient is φ = 12968063566848.

The previous prime is 21084362267977. The next prime is 21084362268031. The reversal of 21084362268021 is 12086226348012.

21084362268021 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 4 + 362 + 268 + 0 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 273330296100 + 20811031971921 = 522810^2 + 4561911^2 .

It is not a de Polignac number, because 21084362268021 - 2⁶ = 21084362267957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21084362268031) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3372936 + ... + 7317473.

It is an arithmetic number, because the mean of its divisors is an integer number (848432630199).

Almost surely, 2^{21084362268021} is an apocalyptic number.

It is an amenable number.

21084362268021 is a deficient number, since it is larger than the sum of its proper divisors (12852942939939).

21084362268021 is a wasteful number, since it uses less digits than its factorization.

21084362268021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10692307 (or 10692298 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 21084362268021 in words is "twenty-one trillion, eighty-four billion, three hundred sixty-two million, two hundred sixty-eight thousand, twenty-one".