211445774381 has 4 divisors (see below), whose sum is σ = 212989174332. Its totient is φ = 209902374432.

The previous prime is 211445774363. The next prime is 211445774401. The reversal of 211445774381 is 183477544112.

211445774381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54107412100 + 157338362281 = 232610^2 + 396659^2 .

It is a cyclic number.

It is not a de Polignac number, because 211445774381 - 2¹⁴ = 211445757997 is a prime.

It is a super-2 number, since 2×211445774381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211445774341) 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 3 ways as a sum of consecutive naturals, for example, 771699770 + ... + 771700043.

It is an arithmetic number, because the mean of its divisors is an integer number (53247293583).

Almost surely, 2^211445774381 is an apocalyptic number.

It is an amenable number.

211445774381 is a deficient number, since it is larger than the sum of its proper divisors (1543399951).

211445774381 is a wasteful number, since it uses less digits than its factorization.

211445774381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543399950.

The product of its digits is 752640, while the sum is 47.

The spelling of 211445774381 in words is "two hundred eleven billion, four hundred forty-five million, seven hundred seventy-four thousand, three hundred eighty-one".