212251887918 has 120 divisors (see below), whose sum is σ = 553471669872. Its totient is φ = 60619176576.

The previous prime is 212251887899. The next prime is 212251887971. The reversal of 212251887918 is 819788152212.

It is a happy number.

212251887918 is a `hidden beast` number, since 21 + 22 + 518 + 8 + 79 + 18 = 666.

212251887918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 31804230 + ... + 31810902.

Almost surely, 2^212251887918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212251887918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276735834936).

212251887918 is an abundant number, since it is smaller than the sum of its proper divisors (341219781954).

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

212251887918 is a wasteful number, since it uses less digits than its factorization.

212251887918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10708 (or 10692 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 54.

The spelling of 212251887918 in words is "two hundred twelve billion, two hundred fifty-one million, eight hundred eighty-seven thousand, nine hundred eighteen".