212130505 has 32 divisors (see below), whose sum is σ = 284912640. Its totient is φ = 150850560.

The previous prime is 212130491. The next prime is 212130511. The reversal of 212130505 is 505031212.

212130505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212130505 - 2⁵ = 212130473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114940 + ... + 116770.

It is an arithmetic number, because the mean of its divisors is an integer number (8903520).

Almost surely, 2^212130505 is an apocalyptic number.

It is an amenable number.

212130505 is a deficient number, since it is larger than the sum of its proper divisors (72782135).

212130505 is a wasteful number, since it uses less digits than its factorization.

212130505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 212130505 is about 14564.7006491723. The cubic root of 212130505 is about 596.3955238737.

Adding to 212130505 its reverse (505031212), we get a palindrome (717161717).

The spelling of 212130505 in words is "two hundred twelve million, one hundred thirty thousand, five hundred five".