421203620 has 12 divisors (see below), whose sum is σ = 884527644. Its totient is φ = 168481440.

The previous prime is 421203617. The next prime is 421203637. The reversal of 421203620 is 26302124.

It can be written as a sum of positive squares in 2 ways, for example, as 160833124 + 260370496 = 12682^2 + 16136^2 .

It is a super-2 number, since 2×421203620² = 354824979002208800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 21060181 = 421203620 / (4 + 2 + 1 + 2 + 0 + 3 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 421203592 and 421203601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10530071 + ... + 10530110.

It is an arithmetic number, because the mean of its divisors is an integer number (73710637).

Almost surely, 2^421203620 is an apocalyptic number.

It is an amenable number.

421203620 is an abundant number, since it is smaller than the sum of its proper divisors (463324024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421203620 is a wasteful number, since it uses less digits than its factorization.

421203620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21060190 (or 21060188 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 421203620 is about 20523.2458446514. The cubic root of 421203620 is about 749.6019339471.

Adding to 421203620 its reverse (26302124), we get a palindrome (447505744).

The spelling of 421203620 in words is "four hundred twenty-one million, two hundred three thousand, six hundred twenty".