420044921 has 2 divisors, whose sum is σ = 420044922. Its totient is φ = 420044920.

The previous prime is 420044899. The next prime is 420044953. The reversal of 420044921 is 129440024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 418652521 + 1392400 = 20461^2 + 1180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420044921 is a prime.

It is not a weakly prime, because it can be changed into another prime (420044021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210022460 + 210022461.

It is an arithmetic number, because the mean of its divisors is an integer number (210022461).

Almost surely, 2^420044921 is an apocalyptic number.

It is an amenable number.

420044921 is a deficient number, since it is larger than the sum of its proper divisors (1).

420044921 is an equidigital number, since it uses as much as digits as its factorization.

420044921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 420044921 is about 20494.9974627956. The cubic root of 420044921 is about 748.9139367888.

Adding to 420044921 its reverse (129440024), we get a palindrome (549484945).

The spelling of 420044921 in words is "four hundred twenty million, forty-four thousand, nine hundred twenty-one".