21050352125 has 16 divisors (see below), whose sum is σ = 28659099456. Its totient is φ = 15309346000.

The previous prime is 21050352121. The next prime is 21050352137. The reversal of 21050352125 is 52125305012.

It is not a de Polignac number, because 21050352125 - 2² = 21050352121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21050352094 and 21050352103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050352121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7653299 + ... + 7656048.

It is an arithmetic number, because the mean of its divisors is an integer number (1791193716).

Almost surely, 2^21050352125 is an apocalyptic number.

21050352125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21050352125 is a deficient number, since it is larger than the sum of its proper divisors (7608747331).

21050352125 is a wasteful number, since it uses less digits than its factorization.

21050352125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15309373 (or 15309363 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 21050352125 its reverse (52125305012), we get a palindrome (73175657137).

The spelling of 21050352125 in words is "twenty-one billion, fifty million, three hundred fifty-two thousand, one hundred twenty-five".