21001012102011 has 8 divisors (see below), whose sum is σ = 28215100229184. Its totient is φ = 13893799354760.

The previous prime is 21001012101983. The next prime is 21001012102013. The reversal of 21001012102011 is 11020121010012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21001012102011 - 2¹⁰ = 21001012100987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001012102013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26718844521 + ... + 26718845306.

It is an arithmetic number, because the mean of its divisors is an integer number (3526887528648).

Almost surely, 2^{21001012102011} is an apocalyptic number.

21001012102011 is a deficient number, since it is larger than the sum of its proper divisors (7214088127173).

21001012102011 is a wasteful number, since it uses less digits than its factorization.

21001012102011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53437689961.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001012102011 its reverse (11020121010012), we get a palindrome (32021133112023).

The spelling of 21001012102011 in words is "twenty-one trillion, one billion, twelve million, one hundred two thousand, eleven".