2121012012121 has 4 divisors (see below), whose sum is σ = 2170337872912. Its totient is φ = 2071686151332.

The previous prime is 2121012012071. The next prime is 2121012012127. The reversal of 2121012012121 is 1212102101212.

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 2121012012121 - 2¹⁵ = 2121011979353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121012012095 and 2121012012104.

It is not an unprimeable number, because it can be changed into a prime (2121012012127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24662930331 + ... + 24662930416.

It is an arithmetic number, because the mean of its divisors is an integer number (542584468228).

Almost surely, 2^{2121012012121} is an apocalyptic number.

It is an amenable number.

2121012012121 is a deficient number, since it is larger than the sum of its proper divisors (49325860791).

2121012012121 is an equidigital number, since it uses as much as digits as its factorization.

2121012012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49325860790.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2121012012121 its reverse (1212102101212), we get a palindrome (3333114113333).

It can be divided in two parts, 212101 and 2012121, that added together give a palindrome (2224222).

The spelling of 2121012012121 in words is "two trillion, one hundred twenty-one billion, twelve million, twelve thousand, one hundred twenty-one".