212145423555 has 64 divisors (see below), whose sum is σ = 372459870720. Its totient is φ = 102471422976.

The previous prime is 212145423509. The next prime is 212145423593. The reversal of 212145423555 is 555324541212.

It is not a de Polignac number, because 212145423555 - 2⁶ = 212145423491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5999487 + ... + 6034743.

It is an arithmetic number, because the mean of its divisors is an integer number (5819685480).

Almost surely, 2^212145423555 is an apocalyptic number.

212145423555 is a deficient number, since it is larger than the sum of its proper divisors (160314447165).

212145423555 is a wasteful number, since it uses less digits than its factorization.

212145423555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35860.

The product of its digits is 240000, while the sum is 39.

Adding to 212145423555 its reverse (555324541212), we get a palindrome (767469964767).

The spelling of 212145423555 in words is "two hundred twelve billion, one hundred forty-five million, four hundred twenty-three thousand, five hundred fifty-five".