21340431301023 has 24 divisors (see below), whose sum is σ = 31721232381696. Its totient is φ = 13817961003600.

The previous prime is 21340431300961. The next prime is 21340431301043. The reversal of 21340431301023 is 32010313404312.

It is a happy number.

21340431301023 is a `hidden beast` number, since 2 + 1 + 340 + 4 + 313 + 0 + 1 + 0 + 2 + 3 = 666.

It is not a de Polignac number, because 21340431301023 - 2¹² = 21340431296927 is a prime.

It is a super-2 number, since 2×21340431301023² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340431301043) 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, 192502573 + ... + 192613398.

It is an arithmetic number, because the mean of its divisors is an integer number (1321718015904).

Almost surely, 2^{21340431301023} is an apocalyptic number.

21340431301023 is a deficient number, since it is larger than the sum of its proper divisors (10380801080673).

21340431301023 is a wasteful number, since it uses less digits than its factorization.

21340431301023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385116155 (or 385116152 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21340431301023 its reverse (32010313404312), we get a palindrome (53350744705335).

The spelling of 21340431301023 in words is "twenty-one trillion, three hundred forty billion, four hundred thirty-one million, three hundred one thousand, twenty-three".