4419780121 has 2 divisors, whose sum is σ = 4419780122. Its totient is φ = 4419780120.

The previous prime is 4419780107. The next prime is 4419780137. The reversal of 4419780121 is 1210879144.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2594781721 + 1824998400 = 50939^2 + 42720^2 .

It is a cyclic number.

It is not a de Polignac number, because 4419780121 - 2⁷ = 4419779993 is a prime.

It is not a weakly prime, because it can be changed into another prime (4419780151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2209890060 + 2209890061.

It is an arithmetic number, because the mean of its divisors is an integer number (2209890061).

Almost surely, 2^4419780121 is an apocalyptic number.

It is an amenable number.

4419780121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4419780121 is an equidigital number, since it uses as much as digits as its factorization.

4419780121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 4419780121 is about 66481.4268875150. The cubic root of 4419780121 is about 1641.0943668583.

The spelling of 4419780121 in words is "four billion, four hundred nineteen million, seven hundred eighty thousand, one hundred twenty-one".