1010210021 has 2 divisors, whose sum is σ = 1010210022. Its totient is φ = 1010210020.

The previous prime is 1010210009. The next prime is 1010210053. The reversal of 1010210021 is 1200120101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1005587521 + 4622500 = 31711^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010210021 - 2⁶ = 1010209957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1010209990 and 1010210008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010210321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505105010 + 505105011.

It is an arithmetic number, because the mean of its divisors is an integer number (505105011).

Almost surely, 2^1010210021 is an apocalyptic number.

It is an amenable number.

1010210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010210021 is an equidigital number, since it uses as much as digits as its factorization.

1010210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1010210021 is about 31783.8012358497. The cubic root of 1010210021 is about 1003.3918228640.

Adding to 1010210021 its reverse (1200120101), we get a palindrome (2210330122).

The spelling of 1010210021 in words is "one billion, ten million, two hundred ten thousand, twenty-one".