2121601121 has 4 divisors (see below), whose sum is σ = 2213844672. Its totient is φ = 2029357572.

The previous prime is 2121601109. The next prime is 2121601133. The reversal of 2121601121 is 1211061212.

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 an interprime number because it is at equal distance from previous prime (2121601109) and next prime (2121601133).

It is a cyclic number.

It is not a de Polignac number, because 2121601121 - 2⁶ = 2121601057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121601121.

It is not an unprimeable number, because it can be changed into a prime (2121601151) 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, 46121741 + ... + 46121786.

It is an arithmetic number, because the mean of its divisors is an integer number (553461168).

Almost surely, 2^2121601121 is an apocalyptic number.

It is an amenable number.

2121601121 is a deficient number, since it is larger than the sum of its proper divisors (92243551).

2121601121 is an equidigital number, since it uses as much as digits as its factorization.

2121601121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92243550.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 2121601121 is about 46060.8415142407. The cubic root of 2121601121 is about 1284.9549805320.

Adding to 2121601121 its reverse (1211061212), we get a palindrome (3332662333).

The spelling of 2121601121 in words is "two billion, one hundred twenty-one million, six hundred one thousand, one hundred twenty-one".