21034729238 has 8 divisors (see below), whose sum is σ = 33408099432. Its totient is φ = 9898696096.

The previous prime is 21034729237. The next prime is 21034729253. The reversal of 21034729238 is 83292743012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21034729195 and 21034729204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034729237) 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, 309334220 + ... + 309334287.

It is an arithmetic number, because the mean of its divisors is an integer number (4176012429).

Almost surely, 2^21034729238 is an apocalyptic number.

21034729238 is a deficient number, since it is larger than the sum of its proper divisors (12373370194).

21034729238 is a wasteful number, since it uses less digits than its factorization.

21034729238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618668526.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 21034729238 in words is "twenty-one billion, thirty-four million, seven hundred twenty-nine thousand, two hundred thirty-eight".