212006521645 has 4 divisors (see below), whose sum is σ = 254407825980. Its totient is φ = 169605217312.

The previous prime is 212006521609. The next prime is 212006521663. The reversal of 212006521645 is 546125600212.

212006521645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121995121284 + 90011400361 = 349278^2 + 300019^2 .

It is a cyclic number.

It is not a de Polignac number, because 212006521645 - 2¹⁵ = 212006488877 is a prime.

It is a super-3 number, since 3×212006521645³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212006521645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21200652160 + ... + 21200652169.

It is an arithmetic number, because the mean of its divisors is an integer number (63601956495).

Almost surely, 2^212006521645 is an apocalyptic number.

It is an amenable number.

212006521645 is a deficient number, since it is larger than the sum of its proper divisors (42401304335).

212006521645 is an equidigital number, since it uses as much as digits as its factorization.

212006521645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42401304334.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 212006521645 in words is "two hundred twelve billion, six million, five hundred twenty-one thousand, six hundred forty-five".