21250104355 has 12 divisors (see below), whose sum is σ = 26912876832. Its totient is φ = 16105340880.

The previous prime is 21250104353. The next prime is 21250104361. The reversal of 21250104355 is 55340105212.

It is not a de Polignac number, because 21250104355 - 2¹ = 21250104353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250104353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5884651 + ... + 5888260.

It is an arithmetic number, because the mean of its divisors is an integer number (2242739736).

Almost surely, 2^21250104355 is an apocalyptic number.

21250104355 is a deficient number, since it is larger than the sum of its proper divisors (5662772477).

21250104355 is a wasteful number, since it uses less digits than its factorization.

21250104355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11772954 (or 11772935 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21250104355 its reverse (55340105212), we get a palindrome (76590209567).

The spelling of 21250104355 in words is "twenty-one billion, two hundred fifty million, one hundred four thousand, three hundred fifty-five".