21285109582 has 16 divisors (see below), whose sum is σ = 35038749312. Its totient is φ = 9617113720.

The previous prime is 21285109567. The next prime is 21285109583. The reversal of 21285109582 is 28590158212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21285109583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2893048 + ... + 2900395.

It is an arithmetic number, because the mean of its divisors is an integer number (2189921832).

Almost surely, 2^21285109582 is an apocalyptic number.

21285109582 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21285109582 is a deficient number, since it is larger than the sum of its proper divisors (13753639730).

21285109582 is a wasteful number, since it uses less digits than its factorization.

21285109582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793623.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 21285109582 in words is "twenty-one billion, two hundred eighty-five million, one hundred nine thousand, five hundred eighty-two".