21340431301042 has 64 divisors (see below), whose sum is σ = 37267618406400. Its totient is φ = 8976590409600.

The previous prime is 21340431300961. The next prime is 21340431301043. The reversal of 21340431301042 is 24010313404312.

It is a happy number.

It is a super-2 number, since 2×21340431301042² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21340431301042.

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 31 ways as a sum of consecutive naturals, for example, 125483167 + ... + 125653117.

It is an arithmetic number, because the mean of its divisors is an integer number (582306537600).

Almost surely, 2^{21340431301042} is an apocalyptic number.

21340431301042 is a deficient number, since it is larger than the sum of its proper divisors (15927187105358).

21340431301042 is a wasteful number, since it uses less digits than its factorization.

21340431301042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170791.

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

Adding to 21340431301042 its reverse (24010313404312), we get a palindrome (45350744705354).

The spelling of 21340431301042 in words is "twenty-one trillion, three hundred forty billion, four hundred thirty-one million, three hundred one thousand, forty-two".