21000010093 has 2 divisors, whose sum is σ = 21000010094. Its totient is φ = 21000010092.

The previous prime is 21000010037. The next prime is 21000010103. The reversal of 21000010093 is 39001000012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16258035049 + 4741975044 = 127507^2 + 68862^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000010093 - 2⁹ = 21000009581 is a prime.

It is a super-2 number, since 2×21000010093² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000610093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500005046 + 10500005047.

It is an arithmetic number, because the mean of its divisors is an integer number (10500005047).

Almost surely, 2^21000010093 is an apocalyptic number.

It is an amenable number.

21000010093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000010093 is an equidigital number, since it uses as much as digits as its factorization.

21000010093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The spelling of 21000010093 in words is "twenty-one billion, ten thousand, ninety-three".