21110220002 has 8 divisors (see below), whose sum is σ = 31682350812. Its totient is φ = 10549436400.

The previous prime is 21110219993. The next prime is 21110220029. The reversal of 21110220002 is 20002201112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21091462441 + 18757561 = 145229^2 + 4331^2 .

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

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, 2832149 + ... + 2839592.

Almost surely, 2^21110220002 is an apocalyptic number.

21110220002 is a deficient number, since it is larger than the sum of its proper divisors (10572130810).

21110220002 is a wasteful number, since it uses less digits than its factorization.

21110220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5673604.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21110220002 its reverse (20002201112), we get a palindrome (41112421114).

The spelling of 21110220002 in words is "twenty-one billion, one hundred ten million, two hundred twenty thousand, two".