21311404302431 has 8 divisors (see below), whose sum is σ = 21357861041040. Its totient is φ = 21264965555328.

The previous prime is 21311404302403. The next prime is 21311404302443. The reversal of 21311404302431 is 13420340411312.

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

It is a cyclic number.

It is not a de Polignac number, because 21311404302431 - 2¹⁸ = 21311404040287 is a prime.

It is a super-4 number, since 4×21311404302431⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21311404302394 and 21311404302403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311404302031) 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, 2124881 + ... + 6865706.

It is an arithmetic number, because the mean of its divisors is an integer number (2669732630130).

Almost surely, 2^{21311404302431} is an apocalyptic number.

21311404302431 is a deficient number, since it is larger than the sum of its proper divisors (46456738609).

21311404302431 is an equidigital number, since it uses as much as digits as its factorization.

21311404302431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8995753.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21311404302431 its reverse (13420340411312), we get a palindrome (34731744713743).

The spelling of 21311404302431 in words is "twenty-one trillion, three hundred eleven billion, four hundred four million, three hundred two thousand, four hundred thirty-one".