421004387851 has 2 divisors, whose sum is σ = 421004387852. Its totient is φ = 421004387850.

The previous prime is 421004387821. The next prime is 421004387857. The reversal of 421004387851 is 158783400124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421004387851 - 2²¹ = 421002290699 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421004387798 and 421004387807.

It is not a weakly prime, because it can be changed into another prime (421004387857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210502193925 + 210502193926.

It is an arithmetic number, because the mean of its divisors is an integer number (210502193926).

Almost surely, 2^421004387851 is an apocalyptic number.

421004387851 is a deficient number, since it is larger than the sum of its proper divisors (1).

421004387851 is an equidigital number, since it uses as much as digits as its factorization.

421004387851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 43.

Adding to 421004387851 its reverse (158783400124), we get a palindrome (579787787975).

The spelling of 421004387851 in words is "four hundred twenty-one billion, four million, three hundred eighty-seven thousand, eight hundred fifty-one".