20101021122111 has 16 divisors (see below), whose sum is σ = 28582069824000. Its totient is φ = 12521668675968.

The previous prime is 20101021122103. The next prime is 20101021122187. The reversal of 20101021122111 is 11122112010102.

It is a happy number.

It is not a de Polignac number, because 20101021122111 - 2³ = 20101021122103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101021122101) 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, 1417754311 + ... + 1417768488.

It is an arithmetic number, because the mean of its divisors is an integer number (1786379364000).

Almost surely, 2^{20101021122111} is an apocalyptic number.

20101021122111 is a deficient number, since it is larger than the sum of its proper divisors (8481048701889).

20101021122111 is a wasteful number, since it uses less digits than its factorization.

20101021122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835522958.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20101021122111 its reverse (11122112010102), we get a palindrome (31223133132213).

The spelling of 20101021122111 in words is "twenty trillion, one hundred one billion, twenty-one million, one hundred twenty-two thousand, one hundred eleven".