21210220110011 has 4 divisors (see below), whose sum is σ = 21282609940032. Its totient is φ = 21137830279992.

The previous prime is 21210220109963. The next prime is 21210220110059. The reversal of 21210220110011 is 11001102201212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21210220109963) and next prime (21210220110059).

It is a cyclic number.

It is not a de Polignac number, because 21210220110011 - 2³⁸ = 20935342203067 is a prime.

It is a super-3 number, since 3×21210220110011³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210720110011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36194914571 + ... + 36194915156.

It is an arithmetic number, because the mean of its divisors is an integer number (5320652485008).

Almost surely, 2^{21210220110011} is an apocalyptic number.

21210220110011 is a deficient number, since it is larger than the sum of its proper divisors (72389830021).

21210220110011 is an equidigital number, since it uses as much as digits as its factorization.

21210220110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72389830020.

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

Adding to 21210220110011 its reverse (11001102201212), we get a palindrome (32211322311223).

The spelling of 21210220110011 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred ten thousand, eleven".