21013410536 has 8 divisors (see below), whose sum is σ = 39400144770. Its totient is φ = 10506705264.

The previous prime is 21013410529. The next prime is 21013410553. The reversal of 21013410536 is 63501431012.

It can be written as a sum of positive squares in only one way, i.e., 16308822436 + 4704588100 = 127706^2 + 68590^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1313338151 + ... + 1313338166.

Almost surely, 2^21013410536 is an apocalyptic number.

It is an amenable number.

21013410536 is a deficient number, since it is larger than the sum of its proper divisors (18386734234).

21013410536 is a wasteful number, since it uses less digits than its factorization.

21013410536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626676323 (or 2626676319 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21013410536 its reverse (63501431012), we get a palindrome (84514841548).

The spelling of 21013410536 in words is "twenty-one billion, thirteen million, four hundred ten thousand, five hundred thirty-six".