21234132473 has 12 divisors (see below), whose sum is σ = 22478520960. Its totient is φ = 20053769736.

The previous prime is 21234132463. The next prime is 21234132487. The reversal of 21234132473 is 37423143212.

It is not a de Polignac number, because 21234132473 - 2³⁴ = 4054263289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21234132433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212261 + ... + 295842.

It is an arithmetic number, because the mean of its divisors is an integer number (1873210080).

Almost surely, 2^21234132473 is an apocalyptic number.

21234132473 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21234132473 is a deficient number, since it is larger than the sum of its proper divisors (1244388487).

21234132473 is an equidigital number, since it uses as much as digits as its factorization.

21234132473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508228 (or 508205 counting only the distinct ones).

The product of its digits is 24192, while the sum is 32.

Adding to 21234132473 its reverse (37423143212), we get a palindrome (58657275685).

The spelling of 21234132473 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-two thousand, four hundred seventy-three".