20011012112121 has 4 divisors (see below), whose sum is σ = 26681349482832. Its totient is φ = 13340674741412.

The previous prime is 20011012112087. The next prime is 20011012112177. The reversal of 20011012112121 is 12121121011002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20011012112121 - 2⁹ = 20011012111609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011012112121.

It is not an unprimeable number, because it can be changed into a prime (20011012112521) 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, 3335168685351 + ... + 3335168685356.

It is an arithmetic number, because the mean of its divisors is an integer number (6670337370708).

Almost surely, 2^{20011012112121} is an apocalyptic number.

It is an amenable number.

20011012112121 is a deficient number, since it is larger than the sum of its proper divisors (6670337370711).

20011012112121 is an equidigital number, since it uses as much as digits as its factorization.

20011012112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670337370710.

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

Adding to 20011012112121 its reverse (12121121011002), we get a palindrome (32132133123123).

The spelling of 20011012112121 in words is "twenty trillion, eleven billion, twelve million, one hundred twelve thousand, one hundred twenty-one".