2121220005 has 8 divisors (see below), whose sum is σ = 3393952032. Its totient is φ = 1131317328.

The previous prime is 2121219977. The next prime is 2121220081. The reversal of 2121220005 is 5000221212.

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

It is not a de Polignac number, because 2121220005 - 2¹¹ = 2121217957 is a prime.

It is a super-2 number, since 2×2121220005² = 8999148619224400050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 141414667 = 2121220005 / (2 + 1 + 2 + 1 + 2 + 2 + 0 + 0 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70707319 + ... + 70707348.

It is an arithmetic number, because the mean of its divisors is an integer number (424244004).

Almost surely, 2^2121220005 is an apocalyptic number.

It is an amenable number.

2121220005 is a deficient number, since it is larger than the sum of its proper divisors (1272732027).

2121220005 is a wasteful number, since it uses less digits than its factorization.

2121220005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141414675.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2121220005 is about 46056.7042351057. The cubic root of 2121220005 is about 1284.8780345211.

Adding to 2121220005 its reverse (5000221212), we get a palindrome (7121441217).

The spelling of 2121220005 in words is "two billion, one hundred twenty-one million, two hundred twenty thousand, five".