20101121012011 has 4 divisors (see below), whose sum is σ = 21647361089872. Its totient is φ = 18554880934152.

The previous prime is 20101121011963. The next prime is 20101121012029. The reversal of 20101121012011 is 11021012110102.

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 20101121012011 - 2¹³ = 20101121003819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1546240077847 = 20101121012011 / (2 + 0 + 1 + 0 + 1 + 1 + 2 + 1 + 0 + 1 + 2 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101121011982 and 20101121012000.

It is not an unprimeable number, because it can be changed into a prime (20101121012081) 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, 773120038911 + ... + 773120038936.

It is an arithmetic number, because the mean of its divisors is an integer number (5411840272468).

Almost surely, 2^{20101121012011} is an apocalyptic number.

20101121012011 is a deficient number, since it is larger than the sum of its proper divisors (1546240077861).

20101121012011 is a wasteful number, since it uses less digits than its factorization.

20101121012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546240077860.

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

Adding to 20101121012011 its reverse (11021012110102), we get a palindrome (31122133122113).

The spelling of 20101121012011 in words is "twenty trillion, one hundred one billion, one hundred twenty-one million, twelve thousand, eleven".