21506250230735 has 8 divisors (see below), whose sum is σ = 25807525287216. Its totient is φ = 17204983511040.

The previous prime is 21506250230723. The next prime is 21506250230743. The reversal of 21506250230735 is 53703205260512.

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

It is not a de Polignac number, because 21506250230735 - 2²⁸ = 21505981795279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21506250230692 and 21506250230701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8243492 + ... + 10534118.

It is an arithmetic number, because the mean of its divisors is an integer number (3225940660902).

Almost surely, 2^{21506250230735} is an apocalyptic number.

21506250230735 is a deficient number, since it is larger than the sum of its proper divisors (4301275056481).

21506250230735 is a wasteful number, since it uses less digits than its factorization.

21506250230735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168393.

The product of its (nonzero) digits is 378000, while the sum is 41.

The spelling of 21506250230735 in words is "twenty-one trillion, five hundred six billion, two hundred fifty million, two hundred thirty thousand, seven hundred thirty-five".