21201001020011 has 16 divisors (see below), whose sum is σ = 21516841886400. Its totient is φ = 20885853058560.

The previous prime is 21201001019971. The next prime is 21201001020013. The reversal of 21201001020011 is 11002010010212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201001020011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201001019974 and 21201001020001.

It is not an unprimeable number, because it can be changed into a prime (21201001020013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 692126666 + ... + 692157296.

It is an arithmetic number, because the mean of its divisors is an integer number (1344802617900).

Almost surely, 2^{21201001020011} is an apocalyptic number.

21201001020011 is a deficient number, since it is larger than the sum of its proper divisors (315840866389).

21201001020011 is an equidigital number, since it uses as much as digits as its factorization.

21201001020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41606.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21201001020011 its reverse (11002010010212), we get a palindrome (32203011030223).

The spelling of 21201001020011 in words is "twenty-one trillion, two hundred one billion, one million, twenty thousand, eleven".