212423136 has 48 divisors (see below), whose sum is σ = 561657600. Its totient is φ = 70293888.

The previous prime is 212423131. The next prime is 212423161. The reversal of 212423136 is 631324212.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212423131) 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, 5385 + ... + 21303.

It is an arithmetic number, because the mean of its divisors is an integer number (11701200).

Almost surely, 2^212423136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212423136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280828800).

212423136 is an abundant number, since it is smaller than the sum of its proper divisors (349234464).

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

212423136 is a wasteful number, since it uses less digits than its factorization.

212423136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16071 (or 16063 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 212423136 is about 14574.7430852142. The cubic root of 212423136 is about 596.6696375676.

Adding to 212423136 its reverse (631324212), we get a palindrome (843747348).

The spelling of 212423136 in words is "two hundred twelve million, four hundred twenty-three thousand, one hundred thirty-six".