2122301821 has 4 divisors (see below), whose sum is σ = 2129082652. Its totient is φ = 2115520992.

The previous prime is 2122301791. The next prime is 2122301827. The reversal of 2122301821 is 1281032212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202635225 + 1919666596 = 14235^2 + 43814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122301821 - 2¹³ = 2122293629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122301792 and 2122301801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122301827) 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, 3389946 + ... + 3390571.

It is an arithmetic number, because the mean of its divisors is an integer number (532270663).

Almost surely, 2^2122301821 is an apocalyptic number.

It is an amenable number.

2122301821 is a deficient number, since it is larger than the sum of its proper divisors (6780831).

2122301821 is an equidigital number, since it uses as much as digits as its factorization.

2122301821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780830.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2122301821 is about 46068.4471303299. The cubic root of 2122301821 is about 1285.0964254126.

The spelling of 2122301821 in words is "two billion, one hundred twenty-two million, three hundred one thousand, eight hundred twenty-one".