21125110535 has 8 divisors (see below), whose sum is σ = 25361468160. Its totient is φ = 16892531424.

The previous prime is 21125110529. The next prime is 21125110597. The reversal of 21125110535 is 53501152112.

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

It is a cyclic number.

It is not a de Polignac number, because 21125110535 - 2⁶ = 21125110471 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 932312 + ... + 954701.

It is an arithmetic number, because the mean of its divisors is an integer number (3170183520).

Almost surely, 2^21125110535 is an apocalyptic number.

21125110535 is a deficient number, since it is larger than the sum of its proper divisors (4236357625).

21125110535 is a wasteful number, since it uses less digits than its factorization.

21125110535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889257.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 21125110535 its reverse (53501152112), we get a palindrome (74626262647).

The spelling of 21125110535 in words is "twenty-one billion, one hundred twenty-five million, one hundred ten thousand, five hundred thirty-five".