21020212093 has 2 divisors, whose sum is σ = 21020212094. Its totient is φ = 21020212092.

The previous prime is 21020212021. The next prime is 21020212099. The reversal of 21020212093 is 39021202012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20567288569 + 452923524 = 143413^2 + 21282^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020212093 - 2⁹ = 21020211581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020212099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510106046 + 10510106047.

It is an arithmetic number, because the mean of its divisors is an integer number (10510106047).

Almost surely, 2^21020212093 is an apocalyptic number.

It is an amenable number.

21020212093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020212093 is an equidigital number, since it uses as much as digits as its factorization.

21020212093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 21020212093 in words is "twenty-one billion, twenty million, two hundred twelve thousand, ninety-three".