421657264547 has 2 divisors, whose sum is σ = 421657264548. Its totient is φ = 421657264546.

The previous prime is 421657264519. The next prime is 421657264549. The reversal of 421657264547 is 745462756124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421657264547 - 2²⁰ = 421656215971 is a prime.

Together with 421657264549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421657264549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210828632273 + 210828632274.

It is an arithmetic number, because the mean of its divisors is an integer number (210828632274).

Almost surely, 2^421657264547 is an apocalyptic number.

421657264547 is a deficient number, since it is larger than the sum of its proper divisors (1).

421657264547 is an equidigital number, since it uses as much as digits as its factorization.

421657264547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11289600, while the sum is 53.

The spelling of 421657264547 in words is "four hundred twenty-one billion, six hundred fifty-seven million, two hundred sixty-four thousand, five hundred forty-seven".