421396561 has 8 divisors (see below), whose sum is σ = 451561824. Its totient is φ = 391828800.

The previous prime is 421396537. The next prime is 421396583. The reversal of 421396561 is 165693124.

421396561 = 3504² + 3505² + ... + 3537².

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

It is a cyclic number.

It is not a de Polignac number, because 421396561 - 2¹¹ = 421394513 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 421396561.

It is not an unprimeable number, because it can be changed into a prime (421396511) 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, 147915 + ... + 150736.

It is an arithmetic number, because the mean of its divisors is an integer number (56445228).

Almost surely, 2^421396561 is an apocalyptic number.

It is an amenable number.

421396561 is a deficient number, since it is larger than the sum of its proper divisors (30165263).

421396561 is a wasteful number, since it uses less digits than its factorization.

421396561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298751.

The product of its digits is 38880, while the sum is 37.

The square root of 421396561 is about 20527.9458543713. The cubic root of 421396561 is about 749.7163733473.

The spelling of 421396561 in words is "four hundred twenty-one million, three hundred ninety-six thousand, five hundred sixty-one".