21724520353270 has 24 divisors (see below), whose sum is σ = 45488485475424. Its totient is φ = 7448406978096.

The previous prime is 21724520353219. The next prime is 21724520353271. The reversal of 21724520353270 is 7235302542712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21724520353271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22167877422 + ... + 22167878401.

It is an arithmetic number, because the mean of its divisors is an integer number (1895353561476).

Almost surely, 2^{21724520353270} is an apocalyptic number.

21724520353270 is an abundant number, since it is smaller than the sum of its proper divisors (23763965122154).

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

21724520353270 is a wasteful number, since it uses less digits than its factorization.

21724520353270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44335755844 (or 44335755837 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 43.

Adding to 21724520353270 its reverse (7235302542712), we get a palindrome (28959822895982).

The spelling of 21724520353270 in words is "twenty-one trillion, seven hundred twenty-four billion, five hundred twenty million, three hundred fifty-three thousand, two hundred seventy".