20121111002101 has 4 divisors (see below), whose sum is σ = 20267980425612. Its totient is φ = 19974241578592.

The previous prime is 20121111002081. The next prime is 20121111002117. The reversal of 20121111002101 is 10120011112102.

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 12192325046001 + 7928785956100 = 3491751^2 + 2815810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121111002101 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 (20121111002701) 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, 73434711550 + ... + 73434711823.

It is an arithmetic number, because the mean of its divisors is an integer number (5066995106403).

Almost surely, 2^{20121111002101} is an apocalyptic number.

It is an amenable number.

20121111002101 is a deficient number, since it is larger than the sum of its proper divisors (146869423511).

20121111002101 is a wasteful number, since it uses less digits than its factorization.

20121111002101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146869423510.

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

Adding to 20121111002101 its reverse (10120011112102), we get a palindrome (30241122114203).

The spelling of 20121111002101 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, two thousand, one hundred one".