21021110093 has 2 divisors, whose sum is σ = 21021110094. Its totient is φ = 21021110092.

The previous prime is 21021110063. The next prime is 21021110119. The reversal of 21021110093 is 39001112012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14218654564 + 6802455529 = 119242^2 + 82477^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021110093 - 2⁶ = 21021110029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021110053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510555046 + 10510555047.

It is an arithmetic number, because the mean of its divisors is an integer number (10510555047).

Almost surely, 2^21021110093 is an apocalyptic number.

It is an amenable number.

21021110093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021110093 is an equidigital number, since it uses as much as digits as its factorization.

21021110093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21021110093 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, ninety-three".