212123450 has 144 divisors (see below), whose sum is σ = 531287424. Its totient is φ = 62092800.

The previous prime is 212123419. The next prime is 212123491. The reversal of 212123450 is 54321212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 457919 + ... + 458381.

It is an arithmetic number, because the mean of its divisors is an integer number (3689496).

Almost surely, 2^212123450 is an apocalyptic number.

212123450 is an abundant number, since it is smaller than the sum of its proper divisors (319163974).

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

212123450 is a wasteful number, since it uses less digits than its factorization.

212123450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 212123450 is about 14564.4584519988. The cubic root of 212123450 is about 596.3889121937.

Adding to 212123450 its reverse (54321212), we get a palindrome (266444662).

The spelling of 212123450 in words is "two hundred twelve million, one hundred twenty-three thousand, four hundred fifty".