21011430013123 has 16 divisors (see below), whose sum is σ = 22999434505056. Its totient is φ = 19036429251840.

The previous prime is 21011430013097. The next prime is 21011430013163. The reversal of 21011430013123 is 32131003411012.

It is not a de Polignac number, because 21011430013123 - 2²¹ = 21011427915971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011430013094 and 21011430013103.

It is not an unprimeable number, because it can be changed into a prime (21011430013163) 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, 16508461 + ... + 17735617.

It is an arithmetic number, because the mean of its divisors is an integer number (1437464656566).

Almost surely, 2^{21011430013123} is an apocalyptic number.

21011430013123 is a deficient number, since it is larger than the sum of its proper divisors (1988004491933).

21011430013123 is a wasteful number, since it uses less digits than its factorization.

21011430013123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232454.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21011430013123 its reverse (32131003411012), we get a palindrome (53142433424135).

The spelling of 21011430013123 in words is "twenty-one trillion, eleven billion, four hundred thirty million, thirteen thousand, one hundred twenty-three".