21253236553510 has 32 divisors (see below), whose sum is σ = 41217198805440. Its totient is φ = 7843802752128.

The previous prime is 21253236553501. The next prime is 21253236553597. The reversal of 21253236553510 is 1535563235212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36650050 + ... + 37225429.

It is an arithmetic number, because the mean of its divisors is an integer number (1288037462670).

Almost surely, 2^{21253236553510} is an apocalyptic number.

21253236553510 is a deficient number, since it is larger than the sum of its proper divisors (19963962251930).

21253236553510 is a wasteful number, since it uses less digits than its factorization.

21253236553510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73877712.

The product of its (nonzero) digits is 810000, while the sum is 43.

Adding to 21253236553510 its reverse (1535563235212), we get a palindrome (22788799788722).

The spelling of 21253236553510 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-six million, five hundred fifty-three thousand, five hundred ten".