21112211121023 has 16 divisors (see below), whose sum is σ = 23422288665600. Its totient is φ = 18867276214080.

The previous prime is 21112211120929. The next prime is 21112211121031. The reversal of 21112211121023 is 32012111221112.

It is a cyclic number.

It is not a de Polignac number, because 21112211121023 - 2¹⁶ = 21112211055487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112211120986 and 21112211121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112211127023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40127858 + ... + 40650576.

It is an arithmetic number, because the mean of its divisors is an integer number (1463893041600).

Almost surely, 2^{21112211121023} is an apocalyptic number.

21112211121023 is a deficient number, since it is larger than the sum of its proper divisors (2310077544577).

21112211121023 is a wasteful number, since it uses less digits than its factorization.

21112211121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585022.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21112211121023 its reverse (32012111221112), we get a palindrome (53124322342135).

The spelling of 21112211121023 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, twenty-three".