21303421432210 has 16 divisors (see below), whose sum is σ = 38359074144600. Its totient is φ = 8518498446976.

The previous prime is 21303421432151. The next prime is 21303421432231. The reversal of 21303421432210 is 1223412430312.

It can be written as a sum of positive squares in 4 ways, for example, as 12869560731889 + 8433860700321 = 3587417^2 + 2904111^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358734565 + ... + 358793944.

Almost surely, 2^{21303421432210} is an apocalyptic number.

21303421432210 is a deficient number, since it is larger than the sum of its proper divisors (17055652712390).

21303421432210 is a wasteful number, since it uses less digits than its factorization.

21303421432210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717531485.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21303421432210 its reverse (1223412430312), we get a palindrome (22526833862522).

The spelling of 21303421432210 in words is "twenty-one trillion, three hundred three billion, four hundred twenty-one million, four hundred thirty-two thousand, two hundred ten".