21364233720252 has 12 divisors (see below), whose sum is σ = 49849878680616. Its totient is φ = 7121411240080.

The previous prime is 21364233720233. The next prime is 21364233720293. The reversal of 21364233720252 is 25202733246312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21364233720252² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890176404999 + ... + 890176405022.

It is an arithmetic number, because the mean of its divisors is an integer number (4154156556718).

Almost surely, 2^{21364233720252} is an apocalyptic number.

It is an amenable number.

21364233720252 is an abundant number, since it is smaller than the sum of its proper divisors (28485644960364).

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

21364233720252 is a wasteful number, since it uses less digits than its factorization.

21364233720252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780352810028 (or 1780352810026 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 42.

Adding to 21364233720252 its reverse (25202733246312), we get a palindrome (46566966966564).

The spelling of 21364233720252 in words is "twenty-one trillion, three hundred sixty-four billion, two hundred thirty-three million, seven hundred twenty thousand, two hundred fifty-two".