21134131829 has 4 divisors (see below), whose sum is σ = 21241411884. Its totient is φ = 21026851776.

The previous prime is 21134131819. The next prime is 21134131897. The reversal of 21134131829 is 92813143112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17842814929 + 3291316900 = 133577^2 + 57370^2 .

It is a cyclic number.

It is not a de Polignac number, because 21134131829 - 2¹⁶ = 21134066293 is a prime.

It is a super-3 number, since 3×21134131829³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134131819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53639732 + ... + 53640125.

It is an arithmetic number, because the mean of its divisors is an integer number (5310352971).

Almost surely, 2^21134131829 is an apocalyptic number.

It is an amenable number.

21134131829 is a deficient number, since it is larger than the sum of its proper divisors (107280055).

21134131829 is a wasteful number, since it uses less digits than its factorization.

21134131829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107280054.

The product of its digits is 10368, while the sum is 35.

The spelling of 21134131829 in words is "twenty-one billion, one hundred thirty-four million, one hundred thirty-one thousand, eight hundred twenty-nine".