21221020210110 has 64 divisors (see below), whose sum is σ = 60213338150400. Its totient is φ = 4683259631232.

The previous prime is 21221020210097. The next prime is 21221020210121. The reversal of 21221020210110 is 1101202012212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21221020210110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1742278000 + ... + 1742290179.

It is an arithmetic number, because the mean of its divisors is an integer number (940833408600).

Almost surely, 2^{21221020210110} is an apocalyptic number.

21221020210110 is an abundant number, since it is smaller than the sum of its proper divisors (38992317940290).

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

21221020210110 is a wasteful number, since it uses less digits than its factorization.

21221020210110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3484568225.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221020210110 its reverse (1101202012212), we get a palindrome (22322222222322).

The spelling of 21221020210110 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred ten thousand, one hundred ten".