21234067243 has 16 divisors (see below), whose sum is σ = 22870723680. Its totient is φ = 19641024000.

The previous prime is 21234067123. The next prime is 21234067247. The reversal of 21234067243 is 34276043212.

It is not a de Polignac number, because 21234067243 - 2⁹ = 21234066731 is a prime.

It is a super-2 number, since 2×21234067243² (a number of 21 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 = 21234067199 and 21234067208.

It is not an unprimeable number, because it can be changed into a prime (21234067247) 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, 1341268 + ... + 1357006.

It is an arithmetic number, because the mean of its divisors is an integer number (1429420230).

Almost surely, 2^21234067243 is an apocalyptic number.

21234067243 is a deficient number, since it is larger than the sum of its proper divisors (1636656437).

21234067243 is a wasteful number, since it uses less digits than its factorization.

21234067243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17118.

The product of its (nonzero) digits is 48384, while the sum is 34.

The spelling of 21234067243 in words is "twenty-one billion, two hundred thirty-four million, sixty-seven thousand, two hundred forty-three".