212156553500 has 96 divisors (see below), whose sum is σ = 468996091200. Its totient is φ = 83830348800.

The previous prime is 212156553473. The next prime is 212156553503. The reversal of 212156553500 is 5355651212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212156553503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77740136 + ... + 77742864.

It is an arithmetic number, because the mean of its divisors is an integer number (4885375950).

Almost surely, 2^212156553500 is an apocalyptic number.

212156553500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212156553500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234498045600).

212156553500 is an abundant number, since it is smaller than the sum of its proper divisors (256839537700).

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

212156553500 is a wasteful number, since it uses less digits than its factorization.

212156553500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584 (or 4572 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 212156553500 in words is "two hundred twelve billion, one hundred fifty-six million, five hundred fifty-three thousand, five hundred".