21250253435107 has 4 divisors (see below), whose sum is σ = 21254599983960. Its totient is φ = 21245906886256.

The previous prime is 21250253435101. The next prime is 21250253435161. The reversal of 21250253435107 is 70153435205212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250253435107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21250253435107.

It is not an unprimeable number, because it can be changed into a prime (21250253435101) 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, 2173267093 + ... + 2173276870.

It is an arithmetic number, because the mean of its divisors is an integer number (5313649995990).

Almost surely, 2^{21250253435107} is an apocalyptic number.

21250253435107 is a deficient number, since it is larger than the sum of its proper divisors (4346548853).

21250253435107 is an equidigital number, since it uses as much as digits as its factorization.

21250253435107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346548852.

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 21250253435107 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-five thousand, one hundred seven".