21100100021011 has 16 divisors (see below), whose sum is σ = 23059909841760. Its totient is φ = 19147257479680.

The previous prime is 21100100020997. The next prime is 21100100021057. The reversal of 21100100021011 is 11012000100112.

It is not a de Polignac number, because 21100100021011 - 2¹³ = 21100100012819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100100021911) 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, 12955185 + ... + 14492653.

It is an arithmetic number, because the mean of its divisors is an integer number (1441244365110).

Almost surely, 2^{21100100021011} is an apocalyptic number.

21100100021011 is a deficient number, since it is larger than the sum of its proper divisors (1959809820749).

21100100021011 is a wasteful number, since it uses less digits than its factorization.

21100100021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539734.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21100100021011 its reverse (11012000100112), we get a palindrome (32112100121123).

The spelling of 21100100021011 in words is "twenty-one trillion, one hundred billion, one hundred million, twenty-one thousand, eleven".