21034729241 has 4 divisors (see below), whose sum is σ = 21054555684. Its totient is φ = 21014902800.

The previous prime is 21034729237. The next prime is 21034729253. The reversal of 21034729241 is 14292743012.

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 12775554841 + 8259174400 = 113029^2 + 90880^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034729241 - 2² = 21034729237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034729211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9911630 + ... + 9913751.

It is an arithmetic number, because the mean of its divisors is an integer number (5263638921).

Almost surely, 2^21034729241 is an apocalyptic number.

It is an amenable number.

21034729241 is a deficient number, since it is larger than the sum of its proper divisors (19826443).

21034729241 is a wasteful number, since it uses less digits than its factorization.

21034729241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19826442.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 21034729241 in words is "twenty-one billion, thirty-four million, seven hundred twenty-nine thousand, two hundred forty-one".