212400045 has 72 divisors (see below), whose sum is σ = 435071520. Its totient is φ = 95022720.

The previous prime is 212400037. The next prime is 212400077. The reversal of 212400045 is 540004212.

It is not a de Polignac number, because 212400045 - 2³ = 212400037 is a prime.

It is a super-2 number, since 2×212400045² = 90227558232004050, which contains 22 as substring.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 82386 + ... + 84924.

It is an arithmetic number, because the mean of its divisors is an integer number (6042660).

Almost surely, 2^212400045 is an apocalyptic number.

It is an amenable number.

212400045 is an abundant number, since it is smaller than the sum of its proper divisors (222671475).

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

212400045 is a wasteful number, since it uses less digits than its factorization.

212400045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587 (or 2571 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 212400045 is about 14573.9509056398. The cubic root of 212400045 is about 596.6480168877.

Adding to 212400045 its reverse (540004212), we get a palindrome (752404257).

The spelling of 212400045 in words is "two hundred twelve million, four hundred thousand, forty-five".