420055102021 has 2 divisors, whose sum is σ = 420055102022. Its totient is φ = 420055102020.

The previous prime is 420055101979. The next prime is 420055102037. The reversal of 420055102021 is 120201550024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238676217025 + 181378884996 = 488545^2 + 425886^2 .

It is a cyclic number.

It is not a de Polignac number, because 420055102021 - 2¹¹ = 420055099973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420055101983 and 420055102001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420055102081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210027551010 + 210027551011.

It is an arithmetic number, because the mean of its divisors is an integer number (210027551011).

Almost surely, 2^420055102021 is an apocalyptic number.

It is an amenable number.

420055102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

420055102021 is an equidigital number, since it uses as much as digits as its factorization.

420055102021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 420055102021 its reverse (120201550024), we get a palindrome (540256652045).

The spelling of 420055102021 in words is "four hundred twenty billion, fifty-five million, one hundred two thousand, twenty-one".