21752203020210 has 96 divisors (see below), whose sum is σ = 64488884307120. Its totient is φ = 5039424405504.

The previous prime is 21752203020173. The next prime is 21752203020221. The reversal of 21752203020210 is 1202030225712.

It can be written as a sum of positive squares in 8 ways, for example, as 4828597523649 + 16923605496561 = 2197407^2 + 4113831^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 546792655 + ... + 546832434.

Almost surely, 2^{21752203020210} is an apocalyptic number.

21752203020210 is an abundant number, since it is smaller than the sum of its proper divisors (42736681286910).

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

21752203020210 is a wasteful number, since it uses less digits than its factorization.

21752203020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093625132 (or 1093625129 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

Adding to 21752203020210 its reverse (1202030225712), we get a palindrome (22954233245922).

The spelling of 21752203020210 in words is "twenty-one trillion, seven hundred fifty-two billion, two hundred three million, twenty thousand, two hundred ten".