21091011821282 has 16 divisors (see below), whose sum is σ = 34108944511992. Its totient is φ = 9723213578880.

The previous prime is 21091011821279. The next prime is 21091011821359. The reversal of 21091011821282 is 28212811019012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16763775620881 + 4327236200401 = 4094359^2 + 2080201^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462458819 + ... + 462504422.

Almost surely, 2^{21091011821282} is an apocalyptic number.

21091011821282 is a deficient number, since it is larger than the sum of its proper divisors (13017932690710).

21091011821282 is a wasteful number, since it uses less digits than its factorization.

21091011821282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924964133.

The product of its (nonzero) digits is 9216, while the sum is 38.

The spelling of 21091011821282 in words is "twenty-one trillion, ninety-one billion, eleven million, eight hundred twenty-one thousand, two hundred eighty-two".