21001323320011 has 32 divisors (see below), whose sum is σ = 22635002880000. Its totient is φ = 19441020023040.

The previous prime is 21001323319979. The next prime is 21001323320071. The reversal of 21001323320011 is 11002332310012.

It is a cyclic number.

It is not a de Polignac number, because 21001323320011 - 2⁵ = 21001323319979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001323320071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61781490 + ... + 62120488.

It is an arithmetic number, because the mean of its divisors is an integer number (707343840000).

Almost surely, 2^{21001323320011} is an apocalyptic number.

21001323320011 is a deficient number, since it is larger than the sum of its proper divisors (1633679559989).

21001323320011 is a wasteful number, since it uses less digits than its factorization.

21001323320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339699.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21001323320011 its reverse (11002332310012), we get a palindrome (32003655630023).

The spelling of 21001323320011 in words is "twenty-one trillion, one billion, three hundred twenty-three million, three hundred twenty thousand, eleven".