420730663021 has 4 divisors (see below), whose sum is σ = 420732025792. Its totient is φ = 420729300252.

The previous prime is 420730662991. The next prime is 420730663079. The reversal of 420730663021 is 120366037024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420730663021 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 (420730603021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27646 + ... + 917728.

It is an arithmetic number, because the mean of its divisors is an integer number (105183006448).

Almost surely, 2^420730663021 is an apocalyptic number.

It is an amenable number.

420730663021 is a deficient number, since it is larger than the sum of its proper divisors (1362771).

420730663021 is an equidigital number, since it uses as much as digits as its factorization.

420730663021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362770.

The product of its (nonzero) digits is 36288, while the sum is 34.

The spelling of 420730663021 in words is "four hundred twenty billion, seven hundred thirty million, six hundred sixty-three thousand, twenty-one".