421052561 has 8 divisors (see below), whose sum is σ = 428526144. Its totient is φ = 413597520.

The previous prime is 421052551. The next prime is 421052579. The reversal of 421052561 is 165250124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421052561 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 421052561.

It is not an unprimeable number, because it can be changed into a prime (421052531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46010 + ... + 54396.

It is an arithmetic number, because the mean of its divisors is an integer number (53565768).

Almost surely, 2^421052561 is an apocalyptic number.

It is an amenable number.

421052561 is a deficient number, since it is larger than the sum of its proper divisors (7473583).

421052561 is an equidigital number, since it uses as much as digits as its factorization.

421052561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9271.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 421052561 is about 20519.5653219068. The cubic root of 421052561 is about 749.5123116896.

The spelling of 421052561 in words is "four hundred twenty-one million, fifty-two thousand, five hundred sixty-one".