21423020210 has 8 divisors (see below), whose sum is σ = 38561436396. Its totient is φ = 8569208080.

The previous prime is 21423020207. The next prime is 21423020219. The reversal of 21423020210 is 1202032412.

It can be written as a sum of positive squares in 2 ways, for example, as 20714981329 + 708038881 = 143927^2 + 26609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21423020219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071151001 + ... + 1071151020.

Almost surely, 2^21423020210 is an apocalyptic number.

21423020210 is a deficient number, since it is larger than the sum of its proper divisors (17138416186).

21423020210 is a wasteful number, since it uses less digits than its factorization.

21423020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142302028.

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

Adding to 21423020210 its reverse (1202032412), we get a palindrome (22625052622).

The spelling of 21423020210 in words is "twenty-one billion, four hundred twenty-three million, twenty thousand, two hundred ten".