21111020122011 has 8 divisors (see below), whose sum is σ = 28152515457024. Its totient is φ = 14071769100840.

The previous prime is 21111020121943. The next prime is 21111020122051. The reversal of 21111020122011 is 11022102011112.

It is a happy number.

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

It is not a de Polignac number, because 21111020122011 - 2³¹ = 21108872638363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111020122051) 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, 561056511 + ... + 561094136.

It is an arithmetic number, because the mean of its divisors is an integer number (3519064432128).

Almost surely, 2^{21111020122011} is an apocalyptic number.

21111020122011 is a deficient number, since it is larger than the sum of its proper divisors (7041495335013).

21111020122011 is a wasteful number, since it uses less digits than its factorization.

21111020122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122156921.

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

Adding to 21111020122011 its reverse (11022102011112), we get a palindrome (32133122133123).

The spelling of 21111020122011 in words is "twenty-one trillion, one hundred eleven billion, twenty million, one hundred twenty-two thousand, eleven".