21211143431 has 8 divisors (see below), whose sum is σ = 21944232720. Its totient is φ = 20478165568.

The previous prime is 21211143427. The next prime is 21211143479. The reversal of 21211143431 is 13434111212.

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 21211143431 - 2² = 21211143427 is a prime.

It is a super-2 number, since 2×21211143431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211143397 and 21211143406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211143731) 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, 598355 + ... + 632811.

It is an arithmetic number, because the mean of its divisors is an integer number (2743029090).

Almost surely, 2^21211143431 is an apocalyptic number.

21211143431 is a deficient number, since it is larger than the sum of its proper divisors (733089289).

21211143431 is a wasteful number, since it uses less digits than its factorization.

21211143431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55713.

The product of its digits is 576, while the sum is 23.

Adding to 21211143431 its reverse (13434111212), we get a palindrome (34645254643).

The spelling of 21211143431 in words is "twenty-one billion, two hundred eleven million, one hundred forty-three thousand, four hundred thirty-one".