21134212073 has 24 divisors (see below), whose sum is σ = 23403907800. Its totient is φ = 18969223680.

The previous prime is 21134211991. The next prime is 21134212081. The reversal of 21134212073 is 37021243112.

It can be written as a sum of positive squares in 12 ways, for example, as 15119899369 + 6014312704 = 122963^2 + 77552^2 .

It is not a de Polignac number, because 21134212073 - 2⁸ = 21134211817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21134212573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4302743 + ... + 4307651.

It is an arithmetic number, because the mean of its divisors is an integer number (975162825).

Almost surely, 2^21134212073 is an apocalyptic number.

It is an amenable number.

21134212073 is a deficient number, since it is larger than the sum of its proper divisors (2269695727).

21134212073 is an equidigital number, since it uses as much as digits as its factorization.

21134212073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133 (or 5072 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21134212073 its reverse (37021243112), we get a palindrome (58155455185).

The spelling of 21134212073 in words is "twenty-one billion, one hundred thirty-four million, two hundred twelve thousand, seventy-three".