420424120132021 has 4 divisors (see below), whose sum is σ = 420472152143532. Its totient is φ = 420376088120512.

The previous prime is 420424120131997. The next prime is 420424120132039. The reversal of 420424120132021 is 120231021424024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286357942228996 + 134066177903025 = 16922114^2 + 11578695^2 .

It is a cyclic number.

It is not a de Polignac number, because 420424120132021 - 2⁵ = 420424120131989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420424120142021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24015992626 + ... + 24016010131.

It is an arithmetic number, because the mean of its divisors is an integer number (105118038035883).

Almost surely, 2^{420424120132021} is an apocalyptic number.

It is an amenable number.

420424120132021 is a deficient number, since it is larger than the sum of its proper divisors (48032011511).

420424120132021 is an equidigital number, since it uses as much as digits as its factorization.

420424120132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48032011510.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 420424120132021 its reverse (120231021424024), we get a palindrome (540655141556045).

The spelling of 420424120132021 in words is "four hundred twenty trillion, four hundred twenty-four billion, one hundred twenty million, one hundred thirty-two thousand, twenty-one".