21255324143052 has 24 divisors (see below), whose sum is σ = 50223550720000. Its totient is φ = 6995423135376.

The previous prime is 21255324143023. The next prime is 21255324143059. The reversal of 21255324143052 is 25034142355212.

It is a self number, because there is not a number n which added to its sum of digits gives 21255324143052.

It is not an unprimeable number, because it can be changed into a prime (21255324143059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11210613052 + ... + 11210614947.

Almost surely, 2^{21255324143052} is an apocalyptic number.

It is an amenable number.

21255324143052 is an abundant number, since it is smaller than the sum of its proper divisors (28968226576948).

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

21255324143052 is a wasteful number, since it uses less digits than its factorization.

21255324143052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22421228085 (or 22421228083 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21255324143052 its reverse (25034142355212), we get a palindrome (46289466498264).

The spelling of 21255324143052 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred twenty-four million, one hundred forty-three thousand, fifty-two".