21000123021011 has 8 divisors (see below), whose sum is σ = 21490520508864. Its totient is φ = 20509817466600.

The previous prime is 21000123021001. The next prime is 21000123021067. The reversal of 21000123021011 is 11012032100012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000123021011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000123021001) 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, 22521065 + ... + 23434986.

It is an arithmetic number, because the mean of its divisors is an integer number (2686315063608).

Almost surely, 2^{21000123021011} is an apocalyptic number.

21000123021011 is a deficient number, since it is larger than the sum of its proper divisors (490397487853).

21000123021011 is a wasteful number, since it uses less digits than its factorization.

21000123021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45966721.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21000123021011 its reverse (11012032100012), we get a palindrome (32012155121023).

The spelling of 21000123021011 in words is "twenty-one trillion, one hundred twenty-three million, twenty-one thousand, eleven".