212154220449 has 6 divisors (see below), whose sum is σ = 306444985106. Its totient is φ = 141436146960.

The previous prime is 212154220441. The next prime is 212154220477. The reversal of 212154220449 is 944022451212.

212154220449 is a `hidden beast` number, since 212 + 15 + 422 + 0 + 4 + 4 + 9 = 666.

212154220449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 210144312225 + 2009908224 = 458415^2 + 44832^2 .

It is not a de Polignac number, because 212154220449 - 2³ = 212154220441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212154220441) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 11786345572 + ... + 11786345589.

Almost surely, 2^212154220449 is an apocalyptic number.

It is an amenable number.

212154220449 is a deficient number, since it is larger than the sum of its proper divisors (94290764657).

212154220449 is a wasteful number, since it uses less digits than its factorization.

212154220449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23572691167 (or 23572691164 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 212154220449 in words is "two hundred twelve billion, one hundred fifty-four million, two hundred twenty thousand, four hundred forty-nine".