21111201022011 has 32 divisors (see below), whose sum is σ = 29088083705856. Its totient is φ = 13605228180000.

The previous prime is 21111201022001. The next prime is 21111201022019. The reversal of 21111201022011 is 11022010211112.

It is a happy number.

It is not a de Polignac number, because 21111201022011 - 2⁶ = 21111201021947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111201022019) 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, 334710900 + ... + 334773966.

It is an arithmetic number, because the mean of its divisors is an integer number (909002615808).

Almost surely, 2^{21111201022011} is an apocalyptic number.

21111201022011 is a deficient number, since it is larger than the sum of its proper divisors (7976882683845).

21111201022011 is a wasteful number, since it uses less digits than its factorization.

21111201022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66983.

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

Adding to 21111201022011 its reverse (11022010211112), we get a palindrome (32133211233123).

The spelling of 21111201022011 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, twenty-two thousand, eleven".