21535751001 has 32 divisors (see below), whose sum is σ = 30472104960. Its totient is φ = 13491043776.

The previous prime is 21535750969. The next prime is 21535751009. The reversal of 21535751001 is 10015753512.

It is not a de Polignac number, because 21535751001 - 2⁵ = 21535750969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21535751001.

It is not an unprimeable number, because it can be changed into a prime (21535751009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3893700 + ... + 3899226.

It is an arithmetic number, because the mean of its divisors is an integer number (952253280).

Almost surely, 2^21535751001 is an apocalyptic number.

It is an amenable number.

21535751001 is a deficient number, since it is larger than the sum of its proper divisors (8936353959).

21535751001 is a wasteful number, since it uses less digits than its factorization.

21535751001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6093.

The product of its (nonzero) digits is 5250, while the sum is 30.

The spelling of 21535751001 in words is "twenty-one billion, five hundred thirty-five million, seven hundred fifty-one thousand, one".