4021686145 has 4 divisors (see below), whose sum is σ = 4826023380. Its totient is φ = 3217348912.

The previous prime is 4021686121. The next prime is 4021686197. The reversal of 4021686145 is 5416861204.

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 1343002609 + 2678683536 = 36647^2 + 51756^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021686145 - 2⁵ = 4021686113 is a prime.

It is a super-2 number, since 2×4021686145² = 32347918897769922050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402168610 + ... + 402168619.

It is an arithmetic number, because the mean of its divisors is an integer number (1206505845).

Almost surely, 2^4021686145 is an apocalyptic number.

It is an amenable number.

4021686145 is a deficient number, since it is larger than the sum of its proper divisors (804337235).

4021686145 is an equidigital number, since it uses as much as digits as its factorization.

4021686145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804337234.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 4021686145 is about 63416.7654883155. The cubic root of 4021686145 is about 1590.2646006905.

The spelling of 4021686145 in words is "four billion, twenty-one million, six hundred eighty-six thousand, one hundred forty-five".