21340431300431 has 8 divisors (see below), whose sum is σ = 21354175307520. Its totient is φ = 21326690287768.

The previous prime is 21340431300379. The next prime is 21340431300449. The reversal of 21340431300431 is 13400313404312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21340431300431 is a prime.

It is a super-2 number, since 2×21340431300431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21340431300394 and 21340431300403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340431300481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13597820 + ... + 15085806.

It is an arithmetic number, because the mean of its divisors is an integer number (2669271913440).

Almost surely, 2^{21340431300431} is an apocalyptic number.

21340431300431 is a deficient number, since it is larger than the sum of its proper divisors (13744007089).

21340431300431 is a wasteful number, since it uses less digits than its factorization.

21340431300431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497213.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 21340431300431 its reverse (13400313404312), we get a palindrome (34740744704743).

The spelling of 21340431300431 in words is "twenty-one trillion, three hundred forty billion, four hundred thirty-one million, three hundred thousand, four hundred thirty-one".