211406812281 has 48 divisors (see below), whose sum is σ = 352717316224. Its totient is φ = 119514258432.

The previous prime is 211406812247. The next prime is 211406812283. The reversal of 211406812281 is 182218604112.

211406812281 is a `hidden beast` number, since 21 + 1 + 406 + 8 + 1 + 228 + 1 = 666.

It is not a de Polignac number, because 211406812281 - 2⁷ = 211406812153 is a prime.

It is a super-2 number, since 2×211406812281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211406812283) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23687886 + ... + 23696808.

Almost surely, 2^211406812281 is an apocalyptic number.

211406812281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211406812281 is a deficient number, since it is larger than the sum of its proper divisors (141310503943).

211406812281 is a wasteful number, since it uses less digits than its factorization.

211406812281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12910 (or 12907 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The spelling of 211406812281 in words is "two hundred eleven billion, four hundred six million, eight hundred twelve thousand, two hundred eighty-one".