21140432023123 has 24 divisors (see below), whose sum is σ = 24683154481440. Its totient is φ = 18053258952960.

The previous prime is 21140432023121. The next prime is 21140432023129. The reversal of 21140432023123 is 32132023404112.

It is not a de Polignac number, because 21140432023123 - 2¹ = 21140432023121 is a prime.

It is a super-2 number, since 2×21140432023123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21140432023091 and 21140432023100.

It is not an unprimeable number, because it can be changed into a prime (21140432023121) 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, 16163290 + ... + 17422192.

It is an arithmetic number, because the mean of its divisors is an integer number (1028464770060).

Almost surely, 2^{21140432023123} is an apocalyptic number.

21140432023123 is a deficient number, since it is larger than the sum of its proper divisors (3542722458317).

21140432023123 is a wasteful number, since it uses less digits than its factorization.

21140432023123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260187 (or 1260180 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21140432023123 its reverse (32132023404112), we get a palindrome (53272455427235).

The spelling of 21140432023123 in words is "twenty-one trillion, one hundred forty billion, four hundred thirty-two million, twenty-three thousand, one hundred twenty-three".