21111043343 has 32 divisors (see below), whose sum is σ = 24783454080. Its totient is φ = 17801441280.

The previous prime is 21111043313. The next prime is 21111043351. The reversal of 21111043343 is 34334011112.

It is a cyclic number.

It is not a de Polignac number, because 21111043343 - 2¹² = 21111039247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111043313) 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, 3586763 + ... + 3592643.

It is an arithmetic number, because the mean of its divisors is an integer number (774482940).

Almost surely, 2^21111043343 is an apocalyptic number.

21111043343 is a deficient number, since it is larger than the sum of its proper divisors (3672410737).

21111043343 is a wasteful number, since it uses less digits than its factorization.

21111043343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21111043343 its reverse (34334011112), we get a palindrome (55445054455).

The spelling of 21111043343 in words is "twenty-one billion, one hundred eleven million, forty-three thousand, three hundred forty-three".