21011013030123 has 12 divisors (see below), whose sum is σ = 30349940239528. Its totient is φ = 14007019314240.

The previous prime is 21011013030089. The next prime is 21011013030131. The reversal of 21011013030123 is 32103031011012.

21011013030123 is a `hidden beast` number, since 210 + 1 + 1 + 0 + 130 + 301 + 23 = 666.

It is not a de Polignac number, because 21011013030123 - 2¹³ = 21011013021931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011013030096 and 21011013030105.

It is not an unprimeable number, because it can be changed into a prime (21011013030023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26479465 + ... + 27261402.

Almost surely, 2^{21011013030123} is an apocalyptic number.

21011013030123 is a deficient number, since it is larger than the sum of its proper divisors (9338927209405).

21011013030123 is a wasteful number, since it uses less digits than its factorization.

21011013030123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53784314 (or 53784311 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21011013030123 its reverse (32103031011012), we get a palindrome (53114044041135).

The spelling of 21011013030123 in words is "twenty-one trillion, eleven billion, thirteen million, thirty thousand, one hundred twenty-three".