21210020201111 has 16 divisors (see below), whose sum is σ = 24604287554880. Its totient is φ = 17908646380800.

The previous prime is 21210020201101. The next prime is 21210020201143. The reversal of 21210020201111 is 11110202001212.

It is not a de Polignac number, because 21210020201111 - 2⁶ = 21210020201047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210020201101) 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, 76002926 + ... + 76281483.

It is an arithmetic number, because the mean of its divisors is an integer number (1537767972180).

Almost surely, 2^{21210020201111} is an apocalyptic number.

21210020201111 is a deficient number, since it is larger than the sum of its proper divisors (3394267353769).

21210020201111 is a wasteful number, since it uses less digits than its factorization.

21210020201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152284714.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210020201111 its reverse (11110202001212), we get a palindrome (32320222202323).

The spelling of 21210020201111 in words is "twenty-one trillion, two hundred ten billion, twenty million, two hundred one thousand, one hundred eleven".