21001230210 has 64 divisors (see below), whose sum is σ = 51156862848. Its totient is φ = 5516949504.

The previous prime is 21001230139. The next prime is 21001230227. The reversal of 21001230210 is 1203210012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 867024 + ... + 890916.

It is an arithmetic number, because the mean of its divisors is an integer number (799325982).

Almost surely, 2^21001230210 is an apocalyptic number.

21001230210 is an abundant number, since it is smaller than the sum of its proper divisors (30155632638).

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

21001230210 is a wasteful number, since it uses less digits than its factorization.

21001230210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24339.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21001230210 its reverse (1203210012), we get a palindrome (22204440222).

The spelling of 21001230210 in words is "twenty-one billion, one million, two hundred thirty thousand, two hundred ten".