420086021 has 2 divisors, whose sum is σ = 420086022. Its totient is φ = 420086020.

The previous prime is 420086011. The next prime is 420086027. The reversal of 420086021 is 120680024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 369177796 + 50908225 = 19214^2 + 7135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420086021 is a prime.

It is a super-2 number, since 2×420086021² = 352944530079224882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420086027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210043010 + 210043011.

It is an arithmetic number, because the mean of its divisors is an integer number (210043011).

Almost surely, 2^420086021 is an apocalyptic number.

It is an amenable number.

420086021 is a deficient number, since it is larger than the sum of its proper divisors (1).

420086021 is an equidigital number, since it uses as much as digits as its factorization.

420086021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 420086021 is about 20496.0001219750. Note that the first 3 decimals coincide. The cubic root of 420086021 is about 748.9383622390.

The spelling of 420086021 in words is "four hundred twenty million, eighty-six thousand, twenty-one".