21253033564340 has 48 divisors (see below), whose sum is σ = 46624728245760. Its totient is φ = 8122365335040.

The previous prime is 21253033564327. The next prime is 21253033564381. The reversal of 21253033564340 is 4346533035212.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 25816220 + ... + 26626739.

It is an arithmetic number, because the mean of its divisors is an integer number (971348505120).

Almost surely, 2^{21253033564340} is an apocalyptic number.

21253033564340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21253033564340 is an abundant number, since it is smaller than the sum of its proper divisors (25371694681420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21253033564340 is a wasteful number, since it uses less digits than its factorization.

21253033564340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52443872 (or 52443870 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 41.

Adding to 21253033564340 its reverse (4346533035212), we get a palindrome (25599566599552).

The spelling of 21253033564340 in words is "twenty-one trillion, two hundred fifty-three billion, thirty-three million, five hundred sixty-four thousand, three hundred forty".