426631865021 has 2 divisors, whose sum is σ = 426631865022. Its totient is φ = 426631865020.

The previous prime is 426631865017. The next prime is 426631865041. The reversal of 426631865021 is 120568136624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421882725625 + 4749139396 = 649525^2 + 68914^2 .

It is a cyclic number.

It is not a de Polignac number, because 426631865021 - 2² = 426631865017 is a prime.

It is a super-3 number, since 3×426631865021³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426631865041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213315932510 + 213315932511.

It is an arithmetic number, because the mean of its divisors is an integer number (213315932511).

Almost surely, 2^426631865021 is an apocalyptic number.

It is an amenable number.

426631865021 is a deficient number, since it is larger than the sum of its proper divisors (1).

426631865021 is an equidigital number, since it uses as much as digits as its factorization.

426631865021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 426631865021 in words is "four hundred twenty-six billion, six hundred thirty-one million, eight hundred sixty-five thousand, twenty-one".