21253235064610 has 32 divisors (see below), whose sum is σ = 40684434819840. Its totient is φ = 7970828032512.

The previous prime is 21253235064599. The next prime is 21253235064619. The reversal of 21253235064610 is 1646053235212.

It is not an unprimeable number, because it can be changed into a prime (21253235064619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576575034 + ... + 576611893.

It is an arithmetic number, because the mean of its divisors is an integer number (1271388588120).

Almost surely, 2^{21253235064610} is an apocalyptic number.

21253235064610 is a deficient number, since it is larger than the sum of its proper divisors (19431199755230).

21253235064610 is a wasteful number, since it uses less digits than its factorization.

21253235064610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153187050.

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 21253235064610 its reverse (1646053235212), we get a palindrome (22899288299822).

The spelling of 21253235064610 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-five million, sixty-four thousand, six hundred ten".