21735091895 has 16 divisors (see below), whose sum is σ = 29950750080. Its totient is φ = 14975373600.

The previous prime is 21735091871. The next prime is 21735091897. The reversal of 21735091895 is 59819053712.

It is not a de Polignac number, because 21735091895 - 2⁸ = 21735091639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21735091897) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10398521 + ... + 10400610.

It is an arithmetic number, because the mean of its divisors is an integer number (1871921880).

Almost surely, 2^21735091895 is an apocalyptic number.

21735091895 is a deficient number, since it is larger than the sum of its proper divisors (8215658185).

21735091895 is a wasteful number, since it uses less digits than its factorization.

21735091895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20799166.

The product of its (nonzero) digits is 680400, while the sum is 50.

The spelling of 21735091895 in words is "twenty-one billion, seven hundred thirty-five million, ninety-one thousand, eight hundred ninety-five".