420243621 has 16 divisors (see below), whose sum is σ = 678040704. Its totient is φ = 226013184.

The previous prime is 420243617. The next prime is 420243667. The reversal of 420243621 is 126342024.

It is not a de Polignac number, because 420243621 - 2² = 420243617 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 420243591 and 420243600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420243221) 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, 588220 + ... + 588933.

It is an arithmetic number, because the mean of its divisors is an integer number (42377544).

Almost surely, 2^420243621 is an apocalyptic number.

It is an amenable number.

420243621 is a deficient number, since it is larger than the sum of its proper divisors (257797083).

420243621 is a wasteful number, since it uses less digits than its factorization.

420243621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177180.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 420243621 is about 20499.8444140437. The cubic root of 420243621 is about 749.0320080819.

Adding to 420243621 its reverse (126342024), we get a palindrome (546585645).

The spelling of 420243621 in words is "four hundred twenty million, two hundred forty-three thousand, six hundred twenty-one".