10212543821 has 2 divisors, whose sum is σ = 10212543822. Its totient is φ = 10212543820.

The previous prime is 10212543799. The next prime is 10212543827. The reversal of 10212543821 is 12834521201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6216534025 + 3996009796 = 78845^2 + 63214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212543821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212543827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106271910 + 5106271911.

It is an arithmetic number, because the mean of its divisors is an integer number (5106271911).

Almost surely, 2^10212543821 is an apocalyptic number.

It is an amenable number.

10212543821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212543821 is an equidigital number, since it uses as much as digits as its factorization.

10212543821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 10212543821 in words is "ten billion, two hundred twelve million, five hundred forty-three thousand, eight hundred twenty-one".