421321026851 has 4 divisors (see below), whose sum is σ = 422223213672. Its totient is φ = 420418840032.

The previous prime is 421321026773. The next prime is 421321026899. The reversal of 421321026851 is 158620123124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421321026851 is a prime.

It is a super-2 number, since 2×421321026851² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421321020851) 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, 451092710 + ... + 451093643.

It is an arithmetic number, because the mean of its divisors is an integer number (105555803418).

Almost surely, 2^421321026851 is an apocalyptic number.

421321026851 is a deficient number, since it is larger than the sum of its proper divisors (902186821).

421321026851 is an equidigital number, since it uses as much as digits as its factorization.

421321026851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902186820.

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 421321026851 its reverse (158620123124), we get a palindrome (579941149975).

The spelling of 421321026851 in words is "four hundred twenty-one billion, three hundred twenty-one million, twenty-six thousand, eight hundred fifty-one".