21123030011011 has 8 divisors (see below), whose sum is σ = 21167875646064. Its totient is φ = 21078191796480.

The previous prime is 21123030010997. The next prime is 21123030011029. The reversal of 21123030011011 is 11011003032112.

It is a happy number.

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 21123030011011 - 2⁷ = 21123030010883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123030011411) 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, 3862735 + ... + 7560871.

It is an arithmetic number, because the mean of its divisors is an integer number (2645984455758).

Almost surely, 2^{21123030011011} is an apocalyptic number.

21123030011011 is a deficient number, since it is larger than the sum of its proper divisors (44845635053).

21123030011011 is a wasteful number, since it uses less digits than its factorization.

21123030011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710261.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21123030011011 its reverse (11011003032112), we get a palindrome (32134033043123).

The spelling of 21123030011011 in words is "twenty-one trillion, one hundred twenty-three billion, thirty million, eleven thousand, eleven".