212123430 has 24 divisors (see below), whose sum is σ = 551521152. Its totient is φ = 56566224.

The previous prime is 212123419. The next prime is 212123491. The reversal of 212123430 is 34321212.

212123430 is a `hidden beast` number, since 21 + 212 + 3 + 430 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1178374 + ... + 1178553.

It is an arithmetic number, because the mean of its divisors is an integer number (22980048).

Almost surely, 2^212123430 is an apocalyptic number.

212123430 is an abundant number, since it is smaller than the sum of its proper divisors (339397722).

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

212123430 is a wasteful number, since it uses less digits than its factorization.

212123430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356940 (or 2356937 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 212123430 is about 14564.4577653959. The cubic root of 212123430 is about 596.3888934502.

Adding to 212123430 its reverse (34321212), we get a palindrome (246444642).

It can be divided in two parts, 21212 and 3430, that added together give a palindrome (24642).

The spelling of 212123430 in words is "two hundred twelve million, one hundred twenty-three thousand, four hundred thirty".