20101010221111 has 4 divisors (see below), whose sum is σ = 20102079840832. Its totient is φ = 20099940601392.

The previous prime is 20101010221091. The next prime is 20101010221169. The reversal of 20101010221111 is 11112201010102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20101010221111 - 2³⁷ = 19963571267639 is a prime.

It is a super-4 number, since 4×20101010221111⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101010221091 and 20101010221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101010224111) 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, 534781671 + ... + 534819256.

It is an arithmetic number, because the mean of its divisors is an integer number (5025519960208).

Almost surely, 2^{20101010221111} is an apocalyptic number.

20101010221111 is a deficient number, since it is larger than the sum of its proper divisors (1069619721).

20101010221111 is a wasteful number, since it uses less digits than its factorization.

20101010221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069619720.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20101010221111 its reverse (11112201010102), we get a palindrome (31213211231213).

The spelling of 20101010221111 in words is "twenty trillion, one hundred one billion, ten million, two hundred twenty-one thousand, one hundred eleven".