212663550 has 72 divisors (see below), whose sum is σ = 579759768. Its totient is φ = 51550400.

The previous prime is 212663501. The next prime is 212663551. The reversal of 212663550 is 55366212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212663551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12292 + ... + 24008.

It is an arithmetic number, because the mean of its divisors is an integer number (8052219).

Almost surely, 2^212663550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212663550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289879884).

212663550 is an abundant number, since it is smaller than the sum of its proper divisors (367096218).

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

212663550 is a wasteful number, since it uses less digits than its factorization.

212663550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11754 (or 11738 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 212663550 is about 14582.9883768726. The cubic root of 212663550 is about 596.8946501759.

The spelling of 212663550 in words is "two hundred twelve million, six hundred sixty-three thousand, five hundred fifty".