20121121012011 has 32 divisors (see below), whose sum is σ = 27242673669120. Its totient is φ = 13208329411200.

The previous prime is 20121121011967. The next prime is 20121121012049. The reversal of 20121121012011 is 11021012112102.

It is a happy number.

It is not a de Polignac number, because 20121121012011 - 2⁷ = 20121121011883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121121022011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395895981 + ... + 395946801.

It is an arithmetic number, because the mean of its divisors is an integer number (851333552160).

Almost surely, 2^{20121121012011} is an apocalyptic number.

20121121012011 is a deficient number, since it is larger than the sum of its proper divisors (7121552657109).

20121121012011 is a wasteful number, since it uses less digits than its factorization.

20121121012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58187.

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

Adding to 20121121012011 its reverse (11021012112102), we get a palindrome (31142133124113).

The spelling of 20121121012011 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, twelve thousand, eleven".