21021020220111 has 16 divisors (see below), whose sum is σ = 31238667820800. Its totient is φ = 12495467127168.

The previous prime is 21021020220097. The next prime is 21021020220121. The reversal of 21021020220111 is 11102202012012.

It is not a de Polignac number, because 21021020220111 - 2⁹ = 21021020219599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021020220121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10846758691 + ... + 10846760628.

It is an arithmetic number, because the mean of its divisors is an integer number (1952416738800).

Almost surely, 2^{21021020220111} is an apocalyptic number.

21021020220111 is a deficient number, since it is larger than the sum of its proper divisors (10217647600689).

21021020220111 is a wasteful number, since it uses less digits than its factorization.

21021020220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21693519358.

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

Adding to 21021020220111 its reverse (11102202012012), we get a palindrome (32123222232123).

The spelling of 21021020220111 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred twenty thousand, one hundred eleven".