2120121001111 has 4 divisors (see below), whose sum is σ = 2129460741432. Its totient is φ = 2110781260792.

The previous prime is 2120121001091. The next prime is 2120121001121. The reversal of 2120121001111 is 1111001210212.

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 2120121001111 - 2¹³ = 2120120992919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120121001091 and 2120121001100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120121001121) 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, 4669869820 + ... + 4669870273.

It is an arithmetic number, because the mean of its divisors is an integer number (532365185358).

Almost surely, 2^{2120121001111} is an apocalyptic number.

2120121001111 is a deficient number, since it is larger than the sum of its proper divisors (9339740321).

2120121001111 is an equidigital number, since it uses as much as digits as its factorization.

2120121001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9339740320.

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

Adding to 2120121001111 its reverse (1111001210212), we get a palindrome (3231122211323).

The spelling of 2120121001111 in words is "two trillion, one hundred twenty billion, one hundred twenty-one million, one thousand, one hundred eleven".