2066215421 has 4 divisors (see below), whose sum is σ = 2067118812. Its totient is φ = 2065312032.

The previous prime is 2066215409. The next prime is 2066215423. The reversal of 2066215421 is 1245126602.

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 717489796 + 1348725625 = 26786^2 + 36725^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066215421 - 2⁶ = 2066215357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066215423) 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, 448256 + ... + 452841.

It is an arithmetic number, because the mean of its divisors is an integer number (516779703).

Almost surely, 2^2066215421 is an apocalyptic number.

It is an amenable number.

2066215421 is a deficient number, since it is larger than the sum of its proper divisors (903391).

2066215421 is an equidigital number, since it uses as much as digits as its factorization.

2066215421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903390.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2066215421 is about 45455.6423450379. The cubic root of 2066215421 is about 1273.6747313266.

The spelling of 2066215421 in words is "two billion, sixty-six million, two hundred fifteen thousand, four hundred twenty-one".