101011210021 has 2 divisors, whose sum is σ = 101011210022. Its totient is φ = 101011210020.

The previous prime is 101011210019. The next prime is 101011210037. The reversal of 101011210021 is 120012110101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100036833796 + 974376225 = 316286^2 + 31215^2 .

It is a cyclic number.

It is not a de Polignac number, because 101011210021 - 2¹ = 101011210019 is a prime.

Together with 101011210019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101011210051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50505605010 + 50505605011.

It is an arithmetic number, because the mean of its divisors is an integer number (50505605011).

Almost surely, 2^101011210021 is an apocalyptic number.

It is an amenable number.

101011210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101011210021 is an equidigital number, since it uses as much as digits as its factorization.

101011210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 101011210021 its reverse (120012110101), we get a palindrome (221023320122).

The spelling of 101011210021 in words is "one hundred one billion, eleven million, two hundred ten thousand, twenty-one".