21101201212011 has 16 divisors (see below), whose sum is σ = 29361391584000. Its totient is φ = 13454372432160.

The previous prime is 21101201212009. The next prime is 21101201212019. The reversal of 21101201212011 is 11021210210112.

It is a happy number.

It is not a de Polignac number, because 21101201212011 - 2¹ = 21101201212009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101201212019) 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, 16021261 + ... + 17288238.

It is an arithmetic number, because the mean of its divisors is an integer number (1835086974000).

Almost surely, 2^{21101201212011} is an apocalyptic number.

21101201212011 is a deficient number, since it is larger than the sum of its proper divisors (8260190371989).

21101201212011 is a wasteful number, since it uses less digits than its factorization.

21101201212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33318706.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21101201212011 its reverse (11021210210112), we get a palindrome (32122411422123).

The spelling of 21101201212011 in words is "twenty-one trillion, one hundred one billion, two hundred one million, two hundred twelve thousand, eleven".