21020043410 has 16 divisors (see below), whose sum is σ = 37838923416. Its totient is φ = 8407385088.

The previous prime is 21020043383. The next prime is 21020043419. The reversal of 21020043410 is 1434002012.

It can be written as a sum of positive squares in 4 ways, for example, as 19946760289 + 1073283121 = 141233^2 + 32761^2 .

It is not an unprimeable number, because it can be changed into a prime (21020043419) 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, 74864 + ... + 218276.

Almost surely, 2^21020043410 is an apocalyptic number.

21020043410 is a deficient number, since it is larger than the sum of its proper divisors (16818880006).

21020043410 is a wasteful number, since it uses less digits than its factorization.

21020043410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158077.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21020043410 its reverse (1434002012), we get a palindrome (22454045422).

The spelling of 21020043410 in words is "twenty-one billion, twenty million, forty-three thousand, four hundred ten".