20102111021101 has 4 divisors (see below), whose sum is σ = 20188386175932. Its totient is φ = 20015835866272.

The previous prime is 20102111021039. The next prime is 20102111021131. The reversal of 20102111021101 is 10112011120102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11713499405001 + 8388611616100 = 3422499^2 + 2896310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102111021101 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 (20102111021131) 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, 43137577066 + ... + 43137577531.

It is an arithmetic number, because the mean of its divisors is an integer number (5047096543983).

Almost surely, 2^{20102111021101} is an apocalyptic number.

It is an amenable number.

20102111021101 is a deficient number, since it is larger than the sum of its proper divisors (86275154831).

20102111021101 is an equidigital number, since it uses as much as digits as its factorization.

20102111021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86275154830.

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

Adding to 20102111021101 its reverse (10112011120102), we get a palindrome (30214122141203).

Subtracting from 20102111021101 its reverse (10112011120102), we obtain a palindrome (9990099900999).

The spelling of 20102111021101 in words is "twenty trillion, one hundred two billion, one hundred eleven million, twenty-one thousand, one hundred one".