209912024932281 has 27 divisors (see below), whose sum is σ = 352709832036783. Its totient is φ = 119949554672640.

The previous prime is 209912024932243. The next prime is 209912024932307. The reversal of 209912024932281 is 182239420219902.

The square root of 209912024932281 is 14488341.

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

209912024932281 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 120 + 2 + 493 + 2 + 28 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68275367677881 + 141636657254400 = 8262891^2 + 11901120^2 .

It is not a de Polignac number, because 209912024932281 - 2¹⁵ = 209912024899513 is a prime.

It is a super-2 number, since 2×209912024932281² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209912024930281) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 303910201 + ... + 304600121.

Almost surely, 2^{209912024932281} is an apocalyptic number.

209912024932281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

209912024932281 is the 14488341-st square number.

209912024932281 is the 7244171-st centered octagonal number.

It is an amenable number.

209912024932281 is a deficient number, since it is larger than the sum of its proper divisors (142797807104502).

209912024932281 is an frugal number, since it uses more digits than its factorization.

209912024932281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379862 (or 689931 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 209912024932281 in words is "two hundred nine trillion, nine hundred twelve billion, twenty-four million, nine hundred thirty-two thousand, two hundred eighty-one".