21123311434011 has 24 divisors (see below), whose sum is σ = 33513720664320. Its totient is φ = 12760993632816.

The previous prime is 21123311434007. The next prime is 21123311434031. The reversal of 21123311434011 is 11043411332112.

21123311434011 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 3 + 311 + 4 + 340 + 1 + 1 = 666.

It is not a de Polignac number, because 21123311434011 - 2² = 21123311434007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123311434031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2685390351 + ... + 2685398216.

It is an arithmetic number, because the mean of its divisors is an integer number (1396405027680).

Almost surely, 2^{21123311434011} is an apocalyptic number.

21123311434011 is a deficient number, since it is larger than the sum of its proper divisors (12390409230309).

21123311434011 is a wasteful number, since it uses less digits than its factorization.

21123311434011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370788615 (or 5370788612 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 21123311434011 its reverse (11043411332112), we get a palindrome (32166722766123).

The spelling of 21123311434011 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred eleven million, four hundred thirty-four thousand, eleven".