21110221010 has 8 divisors (see below), whose sum is σ = 37998397836. Its totient is φ = 8444088400.

The previous prime is 21110221009. The next prime is 21110221037. The reversal of 21110221010 is 1012201112.

It can be written as a sum of positive squares in 2 ways, for example, as 20405265409 + 704955601 = 142847^2 + 26551^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21110220982 and 21110221000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055511041 + ... + 1055511060.

Almost surely, 2^21110221010 is an apocalyptic number.

21110221010 is a deficient number, since it is larger than the sum of its proper divisors (16888176826).

21110221010 is a wasteful number, since it uses less digits than its factorization.

21110221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111022108.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21110221010 its reverse (1012201112), we get a palindrome (22122422122).

The spelling of 21110221010 in words is "twenty-one billion, one hundred ten million, two hundred twenty-one thousand, ten".