420716621 has 16 divisors (see below), whose sum is σ = 484323840. Its totient is φ = 362398080.

The previous prime is 420716537. The next prime is 420716627. The reversal of 420716621 is 126617024.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420716621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420716627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4901 + ... + 29418.

It is an arithmetic number, because the mean of its divisors is an integer number (30270240).

Almost surely, 2^420716621 is an apocalyptic number.

420716621 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

420716621 is a deficient number, since it is larger than the sum of its proper divisors (63607219).

420716621 is a wasteful number, since it uses less digits than its factorization.

420716621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34396.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 420716621 is about 20511.3778425536. The cubic root of 420716621 is about 749.3129239461.

The spelling of 420716621 in words is "four hundred twenty million, seven hundred sixteen thousand, six hundred twenty-one".