211987455425 has 12 divisors (see below), whose sum is σ = 262873917180. Its totient is φ = 169583853120.

The previous prime is 211987455413. The next prime is 211987455451. The reversal of 211987455425 is 524554789112.

It can be written as a sum of positive squares in 6 ways, for example, as 3181411216 + 208806044209 = 56404^2 + 456953^2 .

It is not a de Polignac number, because 211987455425 - 2⁴ = 211987455409 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 634379 + ... + 909071.

It is an arithmetic number, because the mean of its divisors is an integer number (21906159765).

Almost surely, 2^211987455425 is an apocalyptic number.

211987455425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211987455425 is a deficient number, since it is larger than the sum of its proper divisors (50886461755).

211987455425 is a wasteful number, since it uses less digits than its factorization.

211987455425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305572 (or 305567 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 53.

The spelling of 211987455425 in words is "two hundred eleven billion, nine hundred eighty-seven million, four hundred fifty-five thousand, four hundred twenty-five".