21020221201111 has 32 divisors (see below), whose sum is σ = 23172665379840. Its totient is φ = 18908617728000.

The previous prime is 21020221201081. The next prime is 21020221201121. The reversal of 21020221201111 is 11110212202012.

It is not a de Polignac number, because 21020221201111 - 2⁹ = 21020221200599 is a prime.

It is a super-3 number, since 3×21020221201111³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020221201121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2939476386 + ... + 2939483536.

It is an arithmetic number, because the mean of its divisors is an integer number (724145793120).

Almost surely, 2^{21020221201111} is an apocalyptic number.

21020221201111 is a deficient number, since it is larger than the sum of its proper divisors (2152444178729).

21020221201111 is a wasteful number, since it uses less digits than its factorization.

21020221201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10887.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21020221201111 its reverse (11110212202012), we get a palindrome (32130433403123).

The spelling of 21020221201111 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred one thousand, one hundred eleven".