212021106749 has 2 divisors, whose sum is σ = 212021106750. Its totient is φ = 212021106748.

The previous prime is 212021106743. The next prime is 212021106769. The reversal of 212021106749 is 947601120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147356176900 + 64664929849 = 383870^2 + 254293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021106749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021106743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010553374 + 106010553375.

It is an arithmetic number, because the mean of its divisors is an integer number (106010553375).

Almost surely, 2^212021106749 is an apocalyptic number.

It is an amenable number.

212021106749 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021106749 is an equidigital number, since it uses as much as digits as its factorization.

212021106749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 212021106749 in words is "two hundred twelve billion, twenty-one million, one hundred six thousand, seven hundred forty-nine".