211634947451 has 2 divisors, whose sum is σ = 211634947452. Its totient is φ = 211634947450.

The previous prime is 211634947439. The next prime is 211634947463. The reversal of 211634947451 is 154749436112.

211634947451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (211634947439) and next prime (211634947463).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211634947451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211634947396 and 211634947405.

It is not a weakly prime, because it can be changed into another prime (211634947411) 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 as a sum of consecutive naturals, namely, 105817473725 + 105817473726.

It is an arithmetic number, because the mean of its divisors is an integer number (105817473726).

Almost surely, 2^211634947451 is an apocalyptic number.

211634947451 is a deficient number, since it is larger than the sum of its proper divisors (1).

211634947451 is an equidigital number, since it uses as much as digits as its factorization.

211634947451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The spelling of 211634947451 in words is "two hundred eleven billion, six hundred thirty-four million, nine hundred forty-seven thousand, four hundred fifty-one".