20012011011121 has 8 divisors (see below), whose sum is σ = 20028012777000. Its totient is φ = 19996009765248.

The previous prime is 20012011011043. The next prime is 20012011011143. The reversal of 20012011011121 is 12111011021002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8273884062096 + 11738126949025 = 2876436^2 + 3426095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20012011011121 - 2¹⁵ = 20012010978353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012018011121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123467485 + ... + 123629461.

It is an arithmetic number, because the mean of its divisors is an integer number (2503501597125).

Almost surely, 2^{20012011011121} is an apocalyptic number.

It is an amenable number.

20012011011121 is a deficient number, since it is larger than the sum of its proper divisors (16001765879).

20012011011121 is a wasteful number, since it uses less digits than its factorization.

20012011011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260003.

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

Adding to 20012011011121 its reverse (12111011021002), we get a palindrome (32123022032123).

The spelling of 20012011011121 in words is "twenty trillion, twelve billion, eleven million, eleven thousand, one hundred twenty-one".