213630420 has 24 divisors (see below), whose sum is σ = 598165344. Its totient is φ = 56968096.

The previous prime is 213630419. The next prime is 213630427. The reversal of 213630420 is 24036312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213630427) 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, 1780194 + ... + 1780313.

It is an arithmetic number, because the mean of its divisors is an integer number (24923556).

Almost surely, 2^213630420 is an apocalyptic number.

213630420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213630420 is an abundant number, since it is smaller than the sum of its proper divisors (384534924).

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

213630420 is a wasteful number, since it uses less digits than its factorization.

213630420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560519 (or 3560517 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 213630420 is about 14616.1013953790. The cubic root of 213630420 is about 597.7978720532.

Adding to 213630420 its reverse (24036312), we get a palindrome (237666732).

The spelling of 213630420 in words is "two hundred thirteen million, six hundred thirty thousand, four hundred twenty".