426521206645421 has 4 divisors (see below), whose sum is σ = 426547862570844. Its totient is φ = 426494550720000.

The previous prime is 426521206645283. The next prime is 426521206645439. The reversal of 426521206645421 is 124546602125624.

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

It can be written as a sum of positive squares in 2 ways, for example, as 326550704469796 + 99970502175625 = 18070714^2 + 9998525^2 .

It is a cyclic number.

It is not a de Polignac number, because 426521206645421 - 2⁴² = 422123160134317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 426521206645421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426521206645021) 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, 13327938710 + ... + 13327970711.

It is an arithmetic number, because the mean of its divisors is an integer number (106636965642711).

Almost surely, 2^{426521206645421} is an apocalyptic number.

It is an amenable number.

426521206645421 is a deficient number, since it is larger than the sum of its proper divisors (26655925423).

426521206645421 is a wasteful number, since it uses less digits than its factorization.

426521206645421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26655925422.

The product of its (nonzero) digits is 5529600, while the sum is 50.

The spelling of 426521206645421 in words is "four hundred twenty-six trillion, five hundred twenty-one billion, two hundred six million, six hundred forty-five thousand, four hundred twenty-one".