4248778421 has 2 divisors, whose sum is σ = 4248778422. Its totient is φ = 4248778420.

The previous prime is 4248778403. The next prime is 4248778441. The reversal of 4248778421 is 1248778424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4053868900 + 194909521 = 63670^2 + 13961^2 .

It is a cyclic number.

It is not a de Polignac number, because 4248778421 - 2²² = 4244584117 is a prime.

It is a super-3 number, since 3×4248778421³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4248778441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2124389210 + 2124389211.

It is an arithmetic number, because the mean of its divisors is an integer number (2124389211).

Almost surely, 2^4248778421 is an apocalyptic number.

It is an amenable number.

4248778421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4248778421 is an equidigital number, since it uses as much as digits as its factorization.

4248778421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 802816, while the sum is 47.

The square root of 4248778421 is about 65182.6542954489. The cubic root of 4248778421 is about 1619.6506919733.

The spelling of 4248778421 in words is "four billion, two hundred forty-eight million, seven hundred seventy-eight thousand, four hundred twenty-one".