21234543411 has 16 divisors (see below), whose sum is σ = 28377331200. Its totient is φ = 14124090240.

The previous prime is 21234543397. The next prime is 21234543457. The reversal of 21234543411 is 11434543212.

It is not a de Polignac number, because 21234543411 - 2⁶ = 21234543347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21234543511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4495531 + ... + 4500251.

It is an arithmetic number, because the mean of its divisors is an integer number (1773583200).

Almost surely, 2^21234543411 is an apocalyptic number.

21234543411 is a deficient number, since it is larger than the sum of its proper divisors (7142787789).

21234543411 is a wasteful number, since it uses less digits than its factorization.

21234543411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7826.

The product of its digits is 11520, while the sum is 30.

The spelling of 21234543411 in words is "twenty-one billion, two hundred thirty-four million, five hundred forty-three thousand, four hundred eleven".