21201520582 has 16 divisors (see below), whose sum is σ = 34757545104. Its totient is φ = 9619236000.

The previous prime is 21201520579. The next prime is 21201520583. The reversal of 21201520582 is 28502510212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201520582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201520583) 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, 878769 + ... + 902572.

It is an arithmetic number, because the mean of its divisors is an integer number (2172346569).

Almost surely, 2^21201520582 is an apocalyptic number.

21201520582 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21201520582 is a deficient number, since it is larger than the sum of its proper divisors (13556024522).

21201520582 is a wasteful number, since it uses less digits than its factorization.

21201520582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781895.

The product of its (nonzero) digits is 3200, while the sum is 28.

The spelling of 21201520582 in words is "twenty-one billion, two hundred one million, five hundred twenty thousand, five hundred eighty-two".