212145550 has 24 divisors (see below), whose sum is σ = 417803616. Its totient is φ = 79866240.

The previous prime is 212145547. The next prime is 212145559. The reversal of 212145550 is 55541212.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212145559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123942 + ... + 125641.

It is an arithmetic number, because the mean of its divisors is an integer number (17408484).

Almost surely, 2^212145550 is an apocalyptic number.

212145550 is a deficient number, since it is larger than the sum of its proper divisors (205658066).

212145550 is a wasteful number, since it uses less digits than its factorization.

212145550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249612 (or 249607 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 212145550 is about 14565.2171284880. The cubic root of 212145550 is about 596.4096229909.

Adding to 212145550 its reverse (55541212), we get a palindrome (267686762).

The spelling of 212145550 in words is "two hundred twelve million, one hundred forty-five thousand, five hundred fifty".