21021210010 has 32 divisors (see below), whose sum is σ = 38024017920. Its totient is φ = 8367287808.

The previous prime is 21021209983. The next prime is 21021210029. The reversal of 21021210010 is 1001212012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1769671 + ... + 1781509.

It is an arithmetic number, because the mean of its divisors is an integer number (1188250560).

Almost surely, 2^21021210010 is an apocalyptic number.

21021210010 is a deficient number, since it is larger than the sum of its proper divisors (17002807910).

21021210010 is a wasteful number, since it uses less digits than its factorization.

21021210010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12702.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21021210010 its reverse (1001212012), we get a palindrome (22022422022).

The spelling of 21021210010 in words is "twenty-one billion, twenty-one million, two hundred ten thousand, ten".