212645505 has 8 divisors (see below), whose sum is σ = 340232832. Its totient is φ = 113410928.

The previous prime is 212645491. The next prime is 212645519. The reversal of 212645505 is 505546212.

It is an interprime number because it is at equal distance from previous prime (212645491) and next prime (212645519).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212645505 - 2¹⁵ = 212612737 is a prime.

It is a super-2 number, since 2×212645505² = 90436221593410050, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7088169 + ... + 7088198.

It is an arithmetic number, because the mean of its divisors is an integer number (42529104).

Almost surely, 2^212645505 is an apocalyptic number.

It is an amenable number.

212645505 is a deficient number, since it is larger than the sum of its proper divisors (127587327).

212645505 is a wasteful number, since it uses less digits than its factorization.

212645505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14176375.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 212645505 is about 14582.3696633983. The cubic root of 212645505 is about 596.8777670623.

The spelling of 212645505 in words is "two hundred twelve million, six hundred forty-five thousand, five hundred five".