211554785075929 has 3 divisors (see below), whose sum is σ = 211554799620853. Its totient is φ = 211554770531006.

The previous prime is 211554785075873. The next prime is 211554785075941. The reversal of 211554785075929 is 929570587455112.

The square root of 211554785075929 is 14544923.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-211554785075929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211554785075129) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7272462 + ... + 21817384.

Almost surely, 2^{211554785075929} is an apocalyptic number.

211554785075929 is the 14544923-rd square number.

211554785075929 is the 7272462-nd centered octagonal number.

It is an amenable number.

211554785075929 is a deficient number, since it is larger than the sum of its proper divisors (14544924).

211554785075929 is an frugal number, since it uses more digits than its factorization.

211554785075929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29089846 (or 14544923 counting only the distinct ones).

The product of its (nonzero) digits is 317520000, while the sum is 70.

The spelling of 211554785075929 in words is "two hundred eleven trillion, five hundred fifty-four billion, seven hundred eighty-five million, seventy-five thousand, nine hundred twenty-nine".